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1 - Absolute Viscosity for Saybolt Viscosimeter Measurements
2 - Absolute Viscosity for Ubbelohde Viscosimeter Measurements
3 - Acceptable Reliability Level
4 - Accumulator Capacity
5 - Accumulator Pre-charge Pressure
6 - Acid Penetration Distance (Acidizing)
7 - Acoustic Transit Time
8 - Additional Pressure Drop in The Skin Zone
9 - Additional Production Estimation with New Wells
10 - Additive Crystalline Salt Amount to Increase The Density - Method II (Single-Salt Systems)
11 - Additive Crystalline Salt and Water Amount to Increase The Density - Method I (Two-Salt Systems)
12 - Adhesion Tension
13 - Allowable Gas Flow Rate in Adsorption Unit
14 - Allowable Gas Velocity Through Gas Separator
15 - Allowable Velocity in Downcomer for Tray type Tower
16 - Amott-Harvey Wettability Index
17 - Amount of Additive Required to Achieve a Required Cement Slurry Density
18 - Amount of Cement to be Left in Casing
19 - Amount of Heat Required to Increase The Temperature
20 - Amount of Mud Required to Displace Cement in Drillpipe
21 - Amplitude Transmission Coefficient in Seismic Reflection and Refraction
22 - Analysis of a Flow Test with Smoothly Varying Rates
23 - Analysis of a post Fracture (Constant-rate Flow Test with Boundary Effects)
24 - Analysis of a Post-Fracture Pressure Buildup Test with Wellbore-Storage Distortion
25 - Analysis of a Well from a PI Test
26 - Analysis of Dst Flow Data with Ramey type Curves
27 - Angle of Twist (Rod Subjucated to Torque)
28 - Annual Gross Revenue after Royalties and Wellhead Taxes
29 - Annuity from Future Value
30 - Annuity from Present Value
31 - Annular Capacity Between Casing and Multiple Strings of Tubing
32 - Annular Capacity Between Casing and Multiple Tubing Strings
33 - Annular Velocity (Using Circulation Rate in Gpm)
34 - Annular Velocity (Using Pump Output in Bbl/min)
35 - Annular Velocity for Given Circulation Rate
36 - Annular Velocity for Given Pump Output
37 - Annular Volume Capacity of Pipe
38 - Annulus Pressure Loss due to Friction During Hydraulic Fracturing (Laminar Flow)
39 - Annulus Pressure Loss due to Friction During Hydraulic Fracturing (Turbulence Flow)
40 - API Gravity
41 - Api Water Loss Calculations
42 - Apparent Facial Tension (De Nouy Ring Method)
43 - Apparent Intensity Reflected by Recorder (Gamma Ray)
44 - Apparent Resistivity
45 - Apparent Sorption Compressibility
46 - Approximate Ideal Counterbalanced Load
47 - Archimedes Number
48 - Area Below The Casing Shoe
49 - Areal Extent of Heated Zone
50 - Atlas Wireline Neutron Lifetime Log
51 - Average Book Rate of Return Method
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52 - Average Compressibility of Oil
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53 - Average Downstroke Load (Sucker-rod Pump)
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54 - Average Fracture Permeability (Pseudo-steady State Case for Pressure Build-up Test)
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55 - Average Fracture Width (Acidizing)
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56 - Average Gas Solubility
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57 - Average Number of Collisions to Reduce Neutron Energy
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58 - Average Permeability for Linear Flow (Layered Beds)
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59 - Average Permeability for Linear Flow (Series Beds)
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60 - Average Permeability for Parallel Layered Systems
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61 - Average Permeability in Radial Systems
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62 - Average Permeability of a Hydraulically Fractured Formation
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63 - Average Reservoir Temperature in a Cyclical Steam Injection Process
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64 - Average Specific Weight of The Formation (Hydraulic Fracturing)
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65 - Average Temperature of Gas a Column
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66 - Average Upstroke Load (Sucker-rod Pump)
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67 - Average Velocity of a Falling Film with Variable Viscosity
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68 - Average Velocity of Flow Through a Circular Tube
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69 - Average Velocity of Flow Through an Annulus
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70 - Average Velocity of Fluids in Flow of Two Adjacent Immiscible Fluids
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71 - Average Velocity Over The Cross Section of a Falling Film
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72 - Average Wellbore Fluid Density (Completion and Workover Fluids)
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73 - Axial Loads in Slips
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74 - Axial Stress Around Vertical Wellbore
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75 - Axis of a Deviated Borehole from an Arbitrary Origin
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76 - Barenblatt-Chorin Universal Velocity Distribution
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77 - Beam Force
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78 - Bed Diameter of Adsorption Unit
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79 - Bed Length of Adsortion Unit
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80 - Benedict-Webb-Rubin Pvt Equation
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81 - Bit Nozzle Pressure Loss
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82 - Bit Nozzle Selection - Optimized Hydraulics for Two and Three Jets
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83 - Block Efficiency Factor
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84 - Blowdown Time in Unsteady Gas Flow
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85 - Boltzmann Equation
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86 - Borehole Torsion (Cylindrical Helical Method)
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87 - Bottom Distillation Column Rate
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88 - Bottom-hole Flowing Pressure During Infinite-acting Pseudoradial Flow
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89 - Bottomhole Annulus Pressure
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90 - Bottomhole Assembly Length Required for a Desired Weight on Bit
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91 - Bottomhole Pressure in a Static Geothermal Well
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92 - Boussinesq Approximation - Buoyancy
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93 - Boussinseq Equation for Liquid Flow Through a Fracture
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94 - Breakthrough Time in an Adsorption Unit
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95 - Breathing Loss of Natural Gas
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96 - Brinkman Number
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97 - Buckingham Reiner Equation
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98 - Buildup Test with Wellbore Phase Redistribution type 1 Pressure Response
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99 - Buildup Test with Wellbore Phase Redistribution type 2 Pressure Response
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100 - Buildup Test with Wellbore Phase Redistribution type 3 Pressure Response
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101 - Bulk Density of Cuttings (Using The Mud Balance)
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102 - Bulk Modulus (Using Lame)
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103 - Bulk Modulus (Using Poisson Ratio and Lame Constant)
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104 - Bulk Modulus (Using Poisson Ratio and Shear Modulus)
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105 - Bulk Modulus Using Poisson's Ratio and Young's Modulus
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106 - Buoyancy Factor
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107 - Buoyancy Factor Using Mud Weight
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108 - Buoyancy Weight
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109 - Calculation of Fractional Flow Curve
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110 - Calculation of Mass Flow Rate
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111 - Calculation of Momentum Flux
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112 - Calculation of Pressure Beyond The Wellbore (Line-Source Solution)
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113 - Calculation of Unknown Interest Rate
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114 - Calculations for The Number of Feet to be Cemented
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115 - Calculations Required for Spotting Pills
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116 - Capacity Coefficient of Valves in Gas Processing
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117 - Capacity Formulas (Bbl/ft)
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118 - Capacity Formulas (Gal/ft)
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119 - Capacity of Tubulars and Open-hole
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120 - Capacity Ratio of a Hydraulically-fractured Surface
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121 - Capillary Number
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122 - Capillary Pressure
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123 - Catagenic Transformation of Oil
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124 - Change in Hoop Stress at Steady State due to Thermal Stress at Wellbore Wall
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125 - Change in Pore Volume due to Initial Water and Rock Expansion
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126 - Characteristic Time for Linear Diffusion in Reservoirs
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127 - Characterization Factor for Oil Distillation
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128 - Choke Discharge Coefficient
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129 - Chromatographic Lag in Polymer Flooding
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130 - Close-ended Displacement Volume of Pipe
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131 - Coefficient of Reflection
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132 - Cohesive Strength of Rocks
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133 - Cole Plot
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134 - Column Diameter of Packed Towers
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135 - Combined Momentum Flux Tensor
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136 - Combined Radiation and Convection
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137 - Combined Solubility - Hydrocarbon Gas, CO2, and H2S - in Each of The Mud Components
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138 - Communication Between Compartments in Tight Gas Reservoirs
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139 - Communication Factor in a Compartment in Tight Gas Reservoirs
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140 - Compaction Correction Factor for Sonic Logs in Shale Lithology
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141 - Components of Stres Tensor in a Creeping Flow Around a Sphere
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142 - Composite Capture Cross Section of The Formation (Schlumberger Thermal Decay Time Tool)
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143 - Compound Interest
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144 - Compressibility Drive in Gas Reservoirs
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145 - Compressibility of Coalbed Methane Formation
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146 - Compressible Flow in a Horizontal Circular Tube
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147 - Compton Scattering
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148 - Contact Angle
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149 - Control Drilling-maximum Drilling Rate (Mdr)
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150 - Convective Mass Transfer for Laminar Flow (Acidizing)
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151 - Conventional Dst Design Without a Water Cushion (Collapse Pressure Calculation)
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152 - Conversion of Pressure into The Mud Weight
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153 - Cooling of an Ideal Gas
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154 - Correct Counterbalance (Sucker-Rod Pump)
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155 - Correction Factor – Hammerlindl
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156 - Correction Factor for Facial Tension (De Nouy Ring Method)
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157 - Correction Factor for Foamless Separation
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158 - Correction Factor for Stagnant Film According to The Penetration Model
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159 - Correlation Factor for Benedict-Webb-Rubin Equation
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160 - Correlation of Mud Cake Resistivity to Mud Resistivity
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161 - Correlation of Mud Filtrate Resistivity to Mud Resistivity
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162 - Corresponding Reciprocal Rate (Post-fracture Production- Constant Bottomhole Flowing Conditions)
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163 - Cost Depletion
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164 - Cost Per Foot During Drilling
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165 - Cost Per Foot of Coring
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166 - Critical Annular Velocity and Critical Flow Rate
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167 - Critical Flow Rate for Flow Regime Change
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168 - Critical Pressure Cavett Relation
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169 - Critical Pressure Values for Pressure in Van Der Waals Equation
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170 - Critical Rate for Horizontal Wells in Edge-water Drive Reservoirs
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171 - Critical Temperature Cavett Method
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172 - Critical Velocity for Change in Flow Regime
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173 - Crossflow Index
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174 - Crown Block Capacity
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175 - Cumulative Effective Compressibility by Fetkovich
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176 - Cumulative Gas Production Using Tarner
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177 - Cumulative Heat Injected for Steam Drive by Myhill and Stegemier
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178 - Cumulative Interest on Operational Expenses During The Lifetime of a Well
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179 - Cumulative Oil Production from Undersaturated Oil Reservoirs
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180 - Cumulative Oil Recovery in a Year from a Steam Flooded Reservoir System
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181 - Current Drag Force (Offshore)
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182 - Curvature Radius for a Borehole
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183 - Cutting Slip Velocity
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184 - Cutting Slip Velocity Method 1
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185 - Cuttings Produced Per Each Foot of Hole Drilled (Bbls)
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186 - Cuttings Produced Per Each Foot of Hole Drilled (Lb)
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187 - D - Exponent
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188 - Damaged/Undamaged Zone Productivity Comparison (Acidizing)
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189 - Darcy Weisbach Equation (Head Loss Form)
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190 - Darcy Weisbach Equation (Pressure Loss Form)
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191 - Dean Number
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192 - Deborah Number
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193 - Decay of Thermal Neutrons
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194 - Deliverability Equation for Shallow Gas Reservoirs
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195 - Density of Brine (Completion and Workover Fluids)
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196 - Depth of a Washout (Method 1)
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197 - Depth of a Washout (Method 2)
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198 - Depth of Carbon - Dioxide Alteration Front (Battlet-Gouedard, 2006)
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199 - Depth of Carbon - Dioxide Alteration Front (Kutchko, 2008)
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200 - Determination of The Controlling Resistance
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201 - Determination of The Diameter of a Falling Sphere
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202 - Difference in Pressure Gradient Between The Cement and Mud
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203 - Differential Hydrostatic Pressure Between Cement in The Annulus and Mud Inside The Casing
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204 - Diffuse - Layer Thickness
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205 - Diffusion Depth in a Geothermal Well
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206 - Diffusion from an Instantaneous Point Source
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207 - Diffusion in a Moving Film
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208 - Diffusion in Polymers
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209 - Diffusion into a Falling Liquid Film(Gas Absorption)
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210 - Diffusion of Low Density Gases with Equal Mass
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211 - Diffusion Potential
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212 - Diffusion Through a Non-isothermal Spherical Film
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213 - Diffusion Through a Stagnant Film
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214 - Diffusion Through a Stagnant Gas Film
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215 - Diffusion Through Cleat Spacing in Coalbed Methane Reservoirs
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216 - Diffusion with a Heterogeneous Chemical Reaction
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217 - Diffusion with a Homogeneous Chemical Reaction
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218 - Diffusion with a Moving Interface
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219 - Diffusion, Convection and Chemical Reaction
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220 - Dilution of Mud System
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221 - Dimensionless Buildup Pressure for Field Calculations
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222 - Dimensionless Buildup Pressure for Liquid Flow
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223 - Dimensionless Buildup Pressure for Steam Or Gas Flow
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224 - Dimensionless Buildup Time
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225 - Dimensionless Cumulative Production (Radial Flow Constant Pressure Production)
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226 - Dimensionless Drawdown Correlating Parameter by Carter
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227 - Dimensionless Fracture Width for Linear Vertical Fracture (Geertsma&Klerk)
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228 - Dimensionless Heat Injection Rate (Gringarten and Sauty)
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229 - Dimensionless Injection Rate of Air for in Situ Combustion
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230 - Dimensionless Length (Linear Flow Constant Rate Production/hydraulically-fractured Wells)
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231 - Dimensionless Length (Linear Flow/constant-rate Production/general Case)
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232 - Dimensionless Pressure (Linear Flow/constant Rate Production/general Case)
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233 - Dimensionless Pressure (Linear Flow/constant Rate Production/hydraulically-fractured Wells)
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234 - Dimensionless Pressure (Radial-flow/constant Pressure Production)
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235 - Dimensionless Pressure (Radial-flow/constant Rate Production)
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236 - Dimensionless Pressure - Kamal and Brigham
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237 - Dimensionless Pressure Drop Across a Skin at The Well Face
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238 - Dimensionless Pressure Drop During Pseudosteady-state Flow for a Fractured Vertical Well in a Square Drainage Area
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239 - Dimensionless Pressure Drop During Pseudosteady-state Flow for a Horizontal Well in a Bounded Reservoir
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240 - Dimensionless Production Time
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241 - Dimensionless Radius of Radial Flow (in Constant Rate Production)
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242 - Dimensionless Rate (Radial Flow/constant Pressure Production)
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243 - Dimensionless Ratio of Effective Volumetric Heat Capacity of Injected Steam to That of The Steam Zone
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244 - Dimensionless Shut-in Time for MDH Method
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245 - Dimensionless Storage Constant for Gases
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246 - Dimensionless Storage Constant for Liquids
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247 - Dimensionless Time (Linear Flow/constant Rate Production/general Case)
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248 - Dimensionless Time (Linear Flow/Constant Rate Production/Hydraulically Fractured Wells)
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249 - Dimensionless Time (Radial Flow/constant Rate Production)
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250 - Dimensionless Time for Interference Testing in Homogeneous Reservoirs by Earlougher
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251 - Dimensionless Time for Semi-Steady State Flow in Cbm
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252 - Dimensionless Time Function (Transient Heat Transfer to The Formation)
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253 - Dimensionless Time in Myhill and Stegemeir
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254 - Dimensionless Time in Wet Combustion by Kuo
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255 - Dimensionless Vertical Well Critical Rate Correlations - Hoyland, Papatzacos and Skjaeveland
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256 - Dimensionless Wellbore Storage Coefficient (Compressible Fluids for Pressure Build-up Test)
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257 - Dimensionless Wellbore Storage Coefficient of Radial Flow (in Constant Rate Production)
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258 - Direction of Dip
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259 - Directional Curvature for a Deviated Well
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260 - Downcomer Velocity in Tray type Tower
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261 - Downhole Operating Pressure (Hydraulic Fracturing)
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262 - Downward Force Or Weight of Casing
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263 - Drag Coefficient
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264 - Drag Force
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265 - Draining of a Cylindrical Tank
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266 - Draining of a Spherical Tank
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267 - Drill Pipe Or Drill Collar Capacity
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268 - Drill Pipe Or Drill Collar Displacement and Weight
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269 - Drill String Design -Drill Pipe Length for Bottomhole Assembly
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270 - Drilled Gas Entry Rate
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271 - Drilling Cost Per Foot
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272 - Drilling Mud Density (Solid Content Analysis of Drilling Muds)
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273 - Drilling Ton Miles (Coring Operation Ton Miles)
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274 - Drilling Ton Miles (Drilling/connection Ton Miles)
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275 - Drilling Ton Miles (Round Trip Ton Miles)
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276 - Drilling Ton Miles (While Making Short Trip Ton Miles)
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277 - Drilling Ton-miles (Setting Casing Ton Miles)
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278 - Duplex Pump Factor
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279 - Duplex Pump Output (by Using Liner Diameter)
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280 - Duplex Pump Output (by Using Rod Diameter)
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281 - Duplex Pump Output by Using Liner and Rod Diameters
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282 - Dykstra-Parsons Coefficient
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283 - Eckert Number
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284 - Effect of Clay on Conductivity
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285 - Effect of Pore Pressure on Stress
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286 - Effective (Apparent) Transmissivity
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287 - Effective Compressibility in Undersaturated Oil Reservoirs by Hawkins
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288 - Effective Emissivity of a Hole
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289 - Effective Interest Rate for Periodic Compounding
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290 - Effective Oil Transmissivity for Thermal Stimulation
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291 - Effective Photoelectric Absorption Cross Section Index
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292 - Effective Porosity
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293 - Effective Stress on Individual Grains
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294 - Effective Thermal Conductivity for a Solid with Spherical Inclusions
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295 - Effective Thermal Conductivity of Composite Solids
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296 - Effective Weight During Drilling
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297 - Effective Wellbore Radius of a Horizontal Well (Method 1- Anisotropic Reservoir)
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298 - Effective Wellbore Radius of a Horizontal Well (Van Der Vlis Et Al. Method
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299 - Effective Wellbore Radius of a Horizontal Well - Method 1- Isotropic Reservoirs
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300 - Effective Wellbore Radius of an Uniform Flux Fractures
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301 - Efficiency of Areal Sweep in Water Flood
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302 - Efficiency of Block and Tackle System
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303 - Efflux Time for Draining a Conical Tank
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304 - Einstein Equation Effective Viscosity
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305 - Ekman Number
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306 - Electric Resistance to a Radial Current from a Wellbore
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307 - Electrical Heating of a Pipe
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308 - Electrochemical Potential (Sp Log)
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309 - Electrokinetic Potential (Developed Across a Mudcake)
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310 - Electron Density Index (GR Absorption Logging)
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311 - Elimination of Circulation in a Rising Gas Bubble
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312 - Energy Emitted from The Surface of a Black Body
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313 - Energy Requirement of Single Stage Ideal Compressor
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314 - Entrance Hole Size (Perforation)
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315 - Epithermal Neutron Diffusion Coefficient
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316 - Epithermal Neutron Distribution (Epithermal Neutron Flux)
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317 - Equilibrium Vaporization Ratio
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318 - Equilibrium Vaporization Ratio of Heptane
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319 - Equivalent Area of Pipe Subject to Uniform Axial Force
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320 - Equivalent Atomic H/c Ratio of Fuel for In-Situ Combustion
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321 - Equivalent Circulating Density
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322 - Equivalent Density of a Wellbore Fluid
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323 - Equivalent Formation Water Resistivity from Sp Log
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324 - Equivalent Mud Weight (Deviated Well)
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325 - Equivalent Mud Weight (Vertical Well)
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326 - Equivalent Skin Factor in Fractured Wells
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327 - Equivalent Volume of Steam Injected by Myhill and Stegemeier
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328 - Equivalent Water Saturation in Burned Zone In-Situ Combustion by Nelson
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329 - Error in Thermocouple Temperature Measurement
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330 - Error Percentage of Porosity Measurements
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331 - Estimates of Cumulative Oil Displacement
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332 - Estimates of Oil Displacement Rate
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333 - Estimating Fraction of Heat Injected in Latent Form (Steam-Drive)
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334 - Estimating Heat Injection Rate (Steam-drive)
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335 - Estimating Performance Prediction of Steam-Drive Reservoirs (Cumulative Oil Produced)
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336 - Estimating Recovery Steam Drive (Volume of Steam in Reservoir)
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337 - Estimating Steady-State Five Spot Injection Rate (Steam-Drive)
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338 - Estimating Volume of Steam Injection (Steam-Drive)
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339 - Estimation of Average Reservoir Pressure Using Mdh Method
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340 - Estimation of Diffusivity at Low Density
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341 - Estimation of Diffusivity of Liquids
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342 - Estimation of Self Diffusivity at High Density
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343 - Estimation of The Viscosity of a Pure Liquid
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344 - Euler Number
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345 - Evaluation of Centrifuge
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346 - Evaluation of Hydrocyclone
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347 - Evaporation Loss from an Oxygen Tank
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348 - Expansion Factor for Diffuse Layer
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349 - Exploration Efficiency
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350 - Eykman Molecular Refraction
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351 - Facial Tension (De Nouy Ring Method)
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352 - Failure Criteria (Mohr-Coulomb)
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353 - Fanning
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354 - Fanning Friction Factor (Laminar Flow)
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355 - Fenske's Method for Minimum Theoretical Plates
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356 - Fertl and Hammack Equation
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357 - Fick's Law of Binary Diffusion
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358 - Filling Losses in Separation Vessel
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359 - Film Condensation on Vertical Pipes
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360 - Film Condensation on Vertical Tubes
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361 - Film Thickness of a Falling Film on a Conical Surface
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362 - Filter Cake on The Fracture (Acidizing)
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363 - Filtration Rate for API Fluid Loss Measurement
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364 - Filtration Volume with Spurt Loss
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365 - Filtration Volume Without Spurt Loss
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366 - Flat-Plate Boundary Layer Model
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367 - Flow Coefficient During Drawdown
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368 - Flow in a Liquid-liquid Ejector Pumb
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369 - Flow in a Slit with Uniform Cross Flow
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370 - Flow Near a Corner
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371 - Flow of Power Law Fluid Through a Narrow Slit
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372 - Flow Period Duration (Hydraulically Fractured Wells)
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373 - Flow Rate Through Orifice
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374 - Flow Through Fracture in Response to Pressure Gradiant
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375 - Fluid Kinetic Force in Conduits
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376 - Fluid Kinetic Force in Flow Around Submerged Objects
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377 - Fluid Volume Required to Spot The Plug
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378 - Force Applied to Stretch Material
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379 - Force Exerted by The Fluid on The Solid Surface of Flow Through an Annulus
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380 - Form Drag
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381 - Formation Compressibility by Using Hydrofrac Data
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382 - Formation Conductivity in Dual Water Model
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383 - Formation Factor (Archie's Equation with Resistivity Logs)
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384 - Formation Factor - Archie's Equation
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385 - Formation Fluid Compressibility (Acidizing)
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386 - Formation Resistivity and Permeability (Carothers) Relation for Limestones
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387 - Formation Resistivity and Permeability (Carothers) Relation for Sandstones
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388 - Formation Resistivity and Porosity Relations for Carbonate Rocks
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389 - Formation Resistivity and Porosity Relations from Well Log Data Based on Porter and Carothers Datas
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390 - Formation Temperature for Given Gradient
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391 - Fraction of Heat Injected in Latent Form by Myhill and Stegemeier
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392 - Fraction of Injected Heat Remaining in Reservoir
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393 - Fraction of The Total Solution Gas Retained in The Reservoir As Free Gas
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394 - Fraction of Total Porosity Occupied by Clays
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395 - Fractional Flow of Water in Hot Floods Dependant on Temperature and Saturation in Hot Water Flood
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396 - Fractional Gas Recovery Below The Critical Desorption Pressure in Coal Bed Methane Reservoirs
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397 - Fracture Coefficient of a Hydraulically Fractured Reservoir
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398 - Fracture Conductivity
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399 - Fracture Conductivity (Bilinear-flow Regime in Gas Wells)
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400 - Fracture Conductivity During Bilinear Flow
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401 - Fracture Fluid Coefficient for Reservoir-controlled Liquids
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402 - Fracture Fluid Coefficient for Viscosity-Controlled Liquids
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403 - Fracture Geometry (Acidizing)
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404 - Fracture Gradient (Eaton)
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405 - Fracture Gradient (Holbrook)
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406 - Fracture Gradient (Hydraulic Fracturing)
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407 - Fracture Gradient (Matthews and Kelly)
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408 - Fracture Gradient (Zoback and Healy)
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409 - Fracture Pressure (Hubert & Willis)
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410 - Fracture Volume (GDK Method)
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411 - Fracture Volume Perkins and Kern Method
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412 - Fracture Width (GDK Method)
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413 - Fracture Width (Perkins and Kern Method)
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414 - Fracture-Fluid Invasion of The Formation (Acidizing)
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415 - Free Air Correction - Gravity Survey
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416 - Free Batch Expansion of a Compressible Fluid
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417 - Free Convection Heat Transfer from a Vertical Plate
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418 - Free Gas in Place
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419 - Freezing of a Spherical Drop
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420 - Fresh Water Filled Porosity (Fresh Water-bearing Limestones)
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421 - Friction Drag
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422 - Friction Factor for Creeping Flow Around a Sphere
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423 - Friction Factor in Drill Pipe
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424 - Friction Factor in Flow Around Submerged Objects
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425 - Friction Factor in Flow Through Conduits
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426 - Friction Factor in Packed Column (Laminar)
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427 - Friction Factor in Packed Column (Turbulant)
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428 - Frictional Pressure Drop (Economides and Nolte)
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429 - Front Displacement of a Particle in The Reservoir - Formation Invasion
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430 - Future Value of an Annuity
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431 - Future Value of Present Sum
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432 - Fxo/fs Approach
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433 - Galilei Number
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434 - Gamma Ray Log Shale Index
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435 - Gas Absorption from Rising Bubbles for Creeping Flow
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436 - Gas Absorption Through Bubbles
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437 - Gas Absorption with Chemical Reaction in an Agitated Tank
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438 - Gas Absorption with Rapid Reaction
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439 - Gas Adsorbed in Coal Bed Methane Reservoirs
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440 - Gas Bubble Radius
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441 - Gas Cap Ratio
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442 - Gas Cap Shrinkage
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443 - Gas Capacity of Separator
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444 - Gas Drive Index in Gas Reservoirs
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445 - Gas Expansion Factor
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446 - Gas Expansion Term in Gas Reservoirs
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447 - Gas Flow Rate into The Wellbore
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448 - Gas Flow under Laminar Viscous Conditions
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449 - Gas Formation Volume Factor
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450 - Gas Hydrate Dissociation Pressure
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451 - Gas Mass Rate Flow in Compressible Tube Flow
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452 - Gas Mass Velocity in an Adsorption Unit
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453 - Gas Mass Velocity in Separator
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454 - Gas Material Balance Equation
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455 - Gas Migration Velocity
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456 - Gas Originally Adsorbed
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457 - Gas Permeability Measurement (Lab Measurement Using Klinkenberg Effect)
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458 - Gas Pressure Testing Time for Unsteady Gas Flow
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459 - Gas Produced by Gas Expansion
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460 - Gas Saturation - Water Drive Gas Reservoirs
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461 - Gas Solubility in Coalbed Methane Reservoirs
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462 - Gas Velocity under Sonic Flow Conditions (Through Choke)
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463 - Gas/Mud Ratio
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464 - Geertsma`s Model for Porosity/Transit-Time Relationship
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465 - Gel Strength (Optimal Solid Removal Efficiency)
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466 - Gel Strength (Solid Control Efficiency)
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467 - Gel Strength (Solids Build-up in System)
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468 - General Form of The Archie Equation - Water Saturation from Resistivity Logs
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469 - General Thermal Conductivity
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470 - Generalized Relationship Between Formation Resistivity Factor and Porosity (Chevron Formula)
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471 - Geometric Coefficient for The Electrode
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472 - Geometric Coefficient for The Lateral Device (Gl)
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473 - Geometric Coefficient for The Normal Sonde
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474 - Geothermal Gradient
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475 - Graetz Number
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476 - Graham Equation Viscosity Ratio
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477 - Grashof Number
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478 - Gravitational Attraction of a Layer (Bouguer Correction)
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479 - Growth of Steam-Heated Area - Marx-Langenheim
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480 - Growth Rate of Return for Continuous Compounding
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481 - Hagen Number
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482 - Hagen Poiseuille Equation
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483 - Hagoort and Hoogstra Gas Flow in Tight Reservoirs
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484 - Half Thickness Value
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485 - Hammerlindl Method for Gas in Place
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486 - Heat Conduction in a Cooling Fan
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487 - Heat Flux Distribution in a Wall
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488 - Heat Loss by Free Convection from a Horizontal Pipe
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489 - Heat Loss Over an Incremental Length of a Well (Two-Phase Flow)
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490 - Heat Released During In-situ Combustion Given by Burger & Sahuguet
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491 - Heat Remaning in Reservoir by Marx and Langenheim
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492 - Heat Transfer Coefficient for Condensation Pure Vapors on Solid Surface
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493 - Heat Transfer in Packed Bed
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494 - Heat Transfer Rate in Laminar Forced Convection Along Heated Flat Plate
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495 - Heating of a Liquid in an Agitated Tank
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496 - Height of Cement in The Annulus
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497 - Height of Downcomer Filling
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498 - High Pressure Region Gas Flow Rate
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499 - Hingle Nonlinear-Resistivity/Linear-Porosity Crossplot
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500 - Hoek and Brown Criteria for Principal Stress Failure
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501 - Horizontal Core Plug Effective Permeability by Stiles
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502 - Horizontal Effective Stress (Assuming No Lateral Strain As Per Lorenz, and Teufel)
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503 - Horizontal Maximum Stress (Bredehoeft)
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504 - Horizontal Well Breakthrough Time (with Gas Cap Or Bottom Water)
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505 - Horizontal Well Breakthrough Time in a Bottom-Water-Drive Reservoir
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506 - Horizontal Well Critical Rate Correlation (Chaperon)
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507 - Horizontal Well Critical Rate Correlations (Giger and Karcher)
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508 - Horizontal Well Critical Rate Correlations - Joshi Method for Gas Coning
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509 - Horizontal Well Critical Rate Correlations – Efros
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510 - Hoskold Method for Annual Rate of Return Prediction -1
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511 - Hoskold Method for Annual Rate of Return Prediction -2
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512 - Humble Equation (Formation Resistivity Factor Vs. Porosity)
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513 - Hydraulic Horse Power for a Hydraulic Fracturing Operation
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514 - Hydraulic Horsepower
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515 - Hydraulics Analysis
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516 - Hydrocarbon Pore Volume Occupied by Gas Cap
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517 - Hydrocarbon Pore Volume Occupied by The Evolved Solution Gas
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518 - Hydrocarbon Pore Volume Occupied by The Remaining Oil
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519 - Hydromechanical Specific Energy (Hmse)
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520 - Hydrostatic Pressure
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521 - Hydrostatic Pressure Decrease - Pulling Wet Pipe out of The Hole
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522 - Hydrostatic Pressure Decrease at Total Depth Caused by Gas-Cut Mud
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523 - Hydrostatic Pressure Gained in Annulus due to Slug
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524 - Hydrostatic Pulling
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525 - Hydrostatic Pulling Wet Pipe out of The Hole
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526 - Ideal Fracture Conductivity Created by Acid Reaction (Acidizing)
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527 - Ignition Delay Time in Insitu Combustion
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528 - Impact Force (Nozzle Hydraulic Analysis)
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529 - Impringing Jet
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530 - Increase Mud Density by Barite
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531 - Increase Mud Density by Calcium Carbonate
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532 - Increase Mud Density by Hematite
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533 - Increase Volume by Barite
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534 - Increase Volume by Calcium Carbonate
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535 - Increase Volume by Hematite
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536 - Incremental Cumulative Oil Production in Undersaturated Reservoirs
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537 - Incremental Density in Any Wellbore Interval (Completion and Workover Fluids)
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538 - Induced Fracture Dip
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539 - Ineffective Porosity
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540 - Inflow Performance Relationship (Ipr) for Horizontal Wells in Solution Gas-drive Reservoirs (Fetkovich)
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541 - Inflow Performance Relationship (Ipr) for Horizontal Wells in Solution Gas-drive Reservoirs (Vogel)
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542 - Influence of Changing Interfacial Area on Mass Transfer
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543 - Inhibitor Injection Rate Required
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544 - Initial Capital Needed to Survive in a Minimum Chance Scenario
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545 - Initial Effective Horizontal Stress
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546 - Initial Gas Cap
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547 - Initial Gas in Place for Water Drive Gas Reservoirs
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548 - Initial Rate Following a Hydraulic Fracturing Operation
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549 - Initial Volume Required to Achieve a Volume with Haematite
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550 - Initial Volume Required to Achieve V Volume with Barite
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551 - Initial Volume Required to Achieve V Volume with Calcium Carbonate
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552 - Injected Air Required to Burn Through Unit Bulk of Reservoir for In-situ Combustion by Nelson and Mcniel
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553 - Injection Pressure for Hydraulic Fracturing
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554 - Injection/casing Pressure Required to Open Valve
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555 - Injectivity Index
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556 - Input Power of a Pump (Using Fuel Consumption Rate)
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557 - Instantaneous Gas–oil Ratio
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558 - Instrumentation Noise Control
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559 - Integrated Radial Geometric Factor (G(R))
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560 - Internal Diameter of Gas Separator
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561 - Internal Rate of Return
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562 - Interporosity Flow Coefficient
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563 - Interporosity Flow Coefficient in Pressure Build-up Test
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564 - Interstitial Velocity
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565 - Isostacy - Airy Hypothesis
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566 - Isothermal Compressibility of Limestones (Newman Correlation)
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567 - Isothermal Compressibility of Oil - Vasquez-Beggs Correlation - P>Pb
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568 - Isothermal Compressibility of Oil - Villena-Lanzi Correlation - P
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569 - Isothermal Compressibility of Water - Osif Correlation
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570 - Jacoby Aromaticity Factor
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571 - Jet Velocity (Nozzle Hydraulic Analysis)
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572 - Jones Equation for Permeability in Rough Fractures with Single Phase Flow
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573 - Joule Thompson Expansion
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574 - Kerns Method for Gas Flow in a Fracture
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575 - Kick Analysis - Formation Pressure with Well Shut-In on a Kick
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576 - Kick Analysis - Height of Influx
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577 - Kick Analysis - Influx
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578 - Kick Analysis - Maximum Pit Gain from a Gas Kick in Water-Based Mud
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579 - Kick Analysis - Maximum Surface Pressure from a Gas Kick in Water-Based Mud
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580 - Kick Analysis - Shut-in Drill Pipe Pressure
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581 - Kick Analysis(Estimate type of Influx)
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582 - Kick Analysis(Formation Pressure with Well Shut in on a Kick)
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583 - Kick Analysis(Height of Influx)
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584 - Kick Analysis(Maximum Pit Gain from a Gas Kick in Water Based Mud)
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585 - Kick Analysis(Maximum Surface Pressure from a Gas Kick in Water Based Mud)
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586 - Kick Analysis(Shut in Drill Pipe Pressure)
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587 - Kill Weight Mud Determination (Moore Eq.)
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588 - Kinematic Viscosity for Saybolt Viscosimeter Measurements
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589 - Kinetic Friction
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590 - Klinkenberg Gas Effect
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591 - Knudsen Flow
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592 - Kozeny Equation
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593 - Kozeny-carman Relationship
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594 - Krieger Dougherty Equation Viscosity Ratio
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595 - Laminar Flow Along a Flat Plate (Approximate Solution)
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596 - Laminar Flow of an Incompressible Power Law Fluid in a Circular Tube
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597 - Laplace Number
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598 - Laser Specific Energy
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599 - Latent Heat of Hydrocarbon Mixture
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600 - Lateral Load Imposed on a Casing Centralizer - Cementing
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601 - Lateral Load Imposed on a Casing Centralizer with a Dogleg - Cementing
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602 - Least Principal Stress As Function of Depth in Gulf of Mexico (Hubbert and Willis)
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603 - Least Principal Stress As Function of Depth in Gulf of Mexico (Matthew and Kelly)
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604 - Lennard Jones Potential
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605 - Leverett J Function
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606 - Lewis Number
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607 - Lifetime of a Hydraulically Fractured Well
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608 - Lift Coefficient
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609 - Line-Source Solution for Damaged Or Stimulated Wells
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610 - Linear Absorption (Attenuation) Coefficient
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611 - Linear Annular Capacity of Pipe
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612 - Linear Capacity of Pipe
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613 - Linearized Mohr Coulomb Criteria
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614 - Linearized Mohr Failure Line
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615 - Liquid Permeability (Permeameter Lab Measurement)
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616 - Load to Break Cement Bond - Cementing
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617 - Loss Less Propagation Time for Water
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618 - Loss of Overbalance due to Falling Mud Level (Dry)
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619 - Loss of Overbalance due to Falling Mud Level (Wet)
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620 - Lost Returns-Loss of Overbalance
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621 - Low Pressure Region Gas Flow Rate for Non-circular Drainage Area
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622 - M Modulus (Using Shear Modulus and Bulk Modulus)
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623 - M Modulus (Using Young's Modulus and Poisson's Ratio)
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624 - Mach Number
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625 - Manning Formula
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626 - Marangoni Number
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627 - Mass Absorption (Attenuation) Coefficient
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628 - Mass Flow Rate As a Function of The Modified Pressure Drop in a Network of Tubes
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629 - Mass Flow Rate in a Rotating Cone Pump
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630 - Mass of Fuel Burned Per Unit Bulk Reservoir Volume Combustion by Nelson and Mcniel
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631 - Mass of Rock Dissolved Per Unit Mass of Acid (Acidizing)
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632 - Mass of Steel Shell in Adsorption Unit
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633 - Mass Rate of Flow
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634 - Mass Rate of Flow in a Squared Duct
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635 - Mass Rate of Flow of a Falling Film
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636 - Mass Rate of Flow of Flow Through an Annulus
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637 - Mass Rate of Flow Through a Circular Tube
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638 - Mass Rate of Flow Through Annulus
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639 - Mass Transfer for Creeping Flow Around a Gas Bubble
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640 - Mass Transfer in Acid Solutions by Fick's Law (Acidizing)
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641 - Mass Transfer to Drops and Bubbles
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642 - Mass Transfer Zone Length of Adsorption Unit
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643 - Matching Conditions at The Cake-to-Rock Interface - Formation Invasion
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644 - Material Balance for Cumulative Water Influx - Havlena and Odeh
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645 - Maximum Allowable Mud Weight
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646 - Maximum Anistropic Failure Stress
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647 - Maximum Compression at Vertical Wellbore
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648 - Maximum Drilling Rate (Mdr) (for 14 3/4 in Diameter Or Larger Holes)
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649 - Maximum Equivalent Derrick Load
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650 - Maximum Flow Rate (Vogel's Equation)
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651 - Maximum Height of Oil Column in Cap Rock
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652 - Maximum Length of a Slant Well in a Given Reservoir Thickness
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653 - Maximum Length of a Slanted Well in a Given Reservoir Thickness
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654 - Maximum Length of Drillpipe for a Specific Bottomhole Assembly (Bha)
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655 - Maximum Normal Stress in Tangential Direction at Wellbore Wall (Hoop Stress)
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656 - Maximum Plane Tangential Stress Acting on Deviated Wellbore
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657 - Maximum Potential for Self-Potential (SP) Log
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658 - Maximum Principal Stress Calculation Using Breakout Width
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659 - Maximum Principal Stress Failure (Hoek and Brown)
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660 - Maximum Principal Stress in Normal Faulting
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661 - Maximum Principal Stress in Reverse Faulting
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662 - Maximum Principal Stress in Strike-slip Faulting
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663 - Maximum Recommended Low Gravity Solids (Lgs)
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664 - Maximum Recommended Solids Fractions in Drilling Fluids
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665 - Maximum Treatment Pressure (Hydraulic Fracturing)
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666 - Maximum Velocity of a Falling Film
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667 - Maximum Velocity of Flow Through a Circular Tube
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668 - Maximum Weight on Bit
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669 - Maximum-Velocity Vz,Maximum of a Falling Film
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670 - Mean Free Path (Photon Absorbtion)
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671 - Mechanical Energy Balance for Wellbore Fluids
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672 - Mechanical Resistant Torque (Pcp)
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673 - Mechanical Specific Energy
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674 - Membrane Potential
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675 - Meterage Model
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676 - Method for Separating Helium from Natural Gas
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677 - Minimum Air Flux Required for Advance of Fire Front by Nelson and Mcniel
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678 - Minimum Compression at Vertical Wellbore
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679 - Minimum Normal Stress in Tangential Direction at Wellbore Wall (Hoop Stress)
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680 - Minimum Number of Jobs to Survive in a Minimum Chance Scenario
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681 - Minimum Polished Rod Load (Sucker Rod Pump)
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682 - Minimum Profit Ratio Per a Risky Job
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683 - Minimum Shut-in Time to Reach Pseudosteady-state for Tight Gas Reservoirs Being Hydraulically Fractured
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684 - Mixing Fluids of Different Densities
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685 - Modified Capillary Number
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686 - Modified Clapeyron Criteria
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687 - Modified Cole Plot
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688 - Modified Kozeny-Carman Relationship
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689 - Modified Lade Criterion
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690 - Modified Rackett Equation
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691 - Modified Van Driest Equation
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692 - Mole Fraction of a Component in Liquid Phase
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693 - Mole Fraction of a Component in Vapor Phase
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694 - Momentum Flux Distribution of Flow Through a Circular Tube
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695 - Momentum Flux Distribution of Flow Through an Annulus
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696 - Momentum Flux Profile of Fluids in Flow of Two Adjacent Immiscible Fluids
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697 - Momentum Fluxes for Creeping Flow into a Slot
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698 - Mooney Equation Viscosity
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699 - Mud Rheology (Herschel and Buckley Law)
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700 - Mud Rheology (Power Law Model-consistency Index)
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701 - Mud Rheology (Power Law Model-power Law Index)
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702 - Mud Rheology (Power Law)
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703 - Mud Rheology Calculations (Bingham Plastic Model)
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704 - Mud Weight Increase Required to Balance Pressure
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705 - Mud Weight Reduction by Dilution - Water/Diesel/Any Liquid
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706 - Mudcake Growth Equation - Formation Invasion
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707 - Mudcake Growth Equation-2 - Formation Invasion
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708 - Mudcake Permeability - Formation Invasion
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709 - Necessary Inhibitor Concentration Required in Liquid Phase to Reduce Hydrate Point
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710 - Net Cash Flow
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711 - Net Present Value
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712 - Neutron Lethargy (Logarithmic Energy Decrement)
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713 - Neutron Porosity of Shale Zone
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714 - New Pump Circulating Pressure
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715 - Nominal Interest
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716 - Non-newtonian Flow in Annulus
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717 - Normal Stress in Radial Direction Near Wellbore
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718 - Normal Stress in Rock at Failure
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719 - Normal Stress in Tangential Direction at Wellbore Wall (Hoop Stress)
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720 - Normal Stress in Tangential Direction Near Wellbore (Hoop Stress)
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721 - Normalized Saturation
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722 - Nozzle Area Calculation
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723 - Number of Sacks of Cement Required
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724 - Number of Sacks of Cement Required for a Given Length of Plug
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725 - Number of Sacks of Lead Cement Required for Annulus
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726 - Number of Sacks of Tail Cement Required for Casing
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727 - Number of Stages of Column
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728 - Nusselt Number
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729 - Ohnesorge Number
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730 - Oil Breakthrough Newly-Swept Zone
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731 - Oil Bubble Radius of The Drainage Area of Each Well Represented by a Circle
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732 - Oil Density (Standing Correlation)
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733 - Oil Formation Volume Factor (Beggs-Standing) Correlation (Bo at P
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734 - Oil Formation Volume Factor (Beggs-Standing) Correlation (Bo at P>Pb)
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735 - Oil Formation Volume Factor - Beggs-Standing Correlation - P
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736 - Oil Formation Volume Factor - Beggs-Standing Correlation - P>Pb
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737 - Oil Formation Volume Factor - Standing
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738 - Oil in Place for Undersaturated Oil Reservoirs Without Fluid Injection
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739 - Oil in Place in Saturated Oil Reservoirs
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740 - Oil Lost in Migration
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741 - Oil Recovery As a Function of The Fraction of Oil Displaced from Heated Zone
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742 - Oil Saturation at Any Depletion State Below The Bubble Point Pressure
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743 - Oil Saturation Determination (IE and CDN Logs)
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744 - Oil Solubilization Factor
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745 - Oil Volume at Breakthrough by Craig, Geffen, and Morse
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746 - Oil Water Ratio from Retort Data
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747 - Oil-Steam Ratio by Marx & Langenheim
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748 - Open-ended Displacement Volume of Pipe
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749 - Operating Cash Income
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750 - Original Gas in Place
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751 - Overall Efficiency (Diesel Engines to Mud Pump)
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752 - Overall Power System Efficiency
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753 - Packed Column Actual Height
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754 - Pair Production (Gamma Ray Interactions)
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755 - Pan - Maddox Equation for Density
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756 - Pan - Maddox Equation for Molecular Weigth
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757 - Payback Period
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758 - Payne Method for Intercompartmental Flow in Tight Gas Reservoirs
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759 - Peclet Number for Fluid Loss (Acidizing)
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760 - Penetration Rate - Drill-Rate Model - Alternative Equation
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761 - Penetration Rate - Drill-Rate Model - Basic Equation
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762 - Peng Robinson Characterization Factor
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763 - Peng Robinson Pvt Equation
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764 - Percentage of Bit Nozzle Pressure Loss
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765 - Perforation Friction Factor
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766 - Perforation Friction Pressure
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767 - Perforation Hole Size (Perforation)
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768 - Perforation Length in Formation
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769 - Perforation Penetration Ratio (Formation of Interest/Reference Formation)
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770 - Perforation Skin Factor
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771 - Performance Coefficient for Shallow Gas Reservoirs
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772 - Permeability and Reservoir Pressure from Buildup Tests
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773 - Permeability and Skin Factor from a Constant-rate Flow Test
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774 - Permeability Determination Using Porosity Data (Kozeny-Carman Equation)
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775 - Phillips Equation (Sandstones)
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776 - Photoelectric Absorption Cross Sectional Area
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777 - Photoelectric Effect
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778 - Pickett Crossplot
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779 - Plastic Viscosity (Bingham Plastic Model)
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780 - Plug Length to Set a Balanced Cement Plug
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781 - Poisson's Ratio (Seismic Arrival Time Method)
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782 - Poisson`s Ratio
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783 - Polar Moment of Inertia
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784 - Polished Rod Horsepower (Sucker-rod Pump)
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785 - Polymer-Mobility
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786 - Pore Growth Function (Acidizing)
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787 - Pore Pressure Increase due to Fluid Activity (Mody & Hale)
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788 - Pore Pressure Increase due to Given Fluid Activity Contrast (Mody and Hale)
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789 - Pore Pressure of Shale (Flemings)
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790 - Pore Pressure of Shale (Traugott)
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791 - Pore Throat Sorting
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792 - Pore Volume Occupied by The Injection of Gas and Water
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793 - Pore Volume Through Squared Method in Tight Gas Reservoirs
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794 - Pore-pressure Gradient - Rehm and McClendon
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795 - Pore-pressure Gradient - Zamora
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796 - Porosity by Using Density Log Data
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797 - Porosity Corrected for Gas Effect
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798 - Porosity Determination IES and FDC Logs
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799 - Porosity Irreversible Plastic Deformation Occurs
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800 - Porosity-Neutron Flux Relationship
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801 - Potential Flow Around a Cylinder
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802 - Power Requirement for Pumping a Compressible Flow Fluid Through a Long Pipe
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803 - Prandtl Number
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804 - Prerecorded Information (Kick Off Tolerance)
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805 - Prerecorded Information (Maximum Allowable Mud Weight from Leak Off Test)
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806 - Prerecorded Information (Maximum Allowable Shut in Casing Pressure)
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807 - Prerecorded Information (Maximum Anticipated Surface Pressure)
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808 - Prerecorded Information (Maximum Formation Pressure to be Controlled by Shut in Well)
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809 - Prerecorded Information (Maximum Influx Height to Equal Maximum Allowable Shut in Casing Pressure)
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810 - Prerecorded Information (Maximum Surface Pressure from Kick Tolerance Factor)
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811 - Present Value of an Annuity
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812 - Present Value of Deferred Annuity
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813 - Present Value of Future Sum
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814 - Present Value of Profit/Investment Ratio for an Oil Well
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815 - Present Value of Uniform Gradient Series
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816 - Present Worth Expectation for a Risky Job
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817 - Pressure Analysis - Pressure by Each Barrel of Mud in Casing
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818 - Pressure Analysis - Surface Pressure During Drill Stem Test
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819 - Pressure Buildup Equation (Horner Equation)
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820 - Pressure Criteria for Separator by Asme (External Radius)
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821 - Pressure Criteria for Separator by Asme (Internal Radius)
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822 - Pressure Distribution in a Creeping Flow Around a Sphere
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823 - Pressure Drop Per Length of The Adsorption Unit
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824 - Pressure Gradient
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825 - Pressure Loss due to Perforations During Hydraulic Fracturing -2
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826 - Pressure Loss due to Sudden Enlargement
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827 - Pressure Required to Break Circulation (Drill String)
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828 - Pressure Required to Break Circulation - Annulus
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829 - Pressure Required to Induce a Tensile Fracture (Breakdown Pressure)
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830 - Pressure Required to Overcome Gel Strength of Mud (Inside The Drill String)
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831 - Pressure Required to Overcome Mud
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832 - Pressure Storage
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833 - Pressure to Grow Fractures (Abe, Mura, Et Al.)
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834 - Principal Stress due to Petro-static Pressure (Hydraulic Fracturing)
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835 - Probability of an Oilfield Discovery
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836 - Produced Gas-oil Ratio
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837 - Productivity Index (for Generating Composite Ipr Curve)
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838 - Productivity Index for a Gas Well
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839 - Productivity Ratio
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840 - Productivity Ratio Calculation of a Hydraulically-Fractured Formation
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841 - Profitability Index
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842 - Proportional Band in Pressure Controller
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843 - Proppant Settlement in Frature
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844 - Pseudo Reduced Conditions
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845 - Pseudo-Skin Factor due to Partial Penetration (Yeh and Reynolds Correlation)
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846 - Pseudo-Skin Factor due to Partial Penetration (Brons and Marting Method)
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847 - Pseudo-skin Factor due to Partial Penetration (Odeh Correlation)
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848 - Pseudo-skin Factor due to Partial Penetration (Papatzacos Correlation)
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849 - Pseudo-Skin Factor due to Partial Penetration (Yeh and Reynolds Correlation)
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850 - Pseudo-Skin Factor due to Perforations
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851 - Pseudo-steady State Productivity of Horizontal Wells (Method 1)
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852 - Pseudo-steady State Productivity of Horizontal Wells (Method 2)
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853 - Pseudo-steady State Productivity of Horizontal Wells (Method 3)
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854 - Pseudo-steady State Radial Flow Equation
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855 - Pump Calculation (Pump Pressure)
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856 - Pump Calculations (Power Required)
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857 - Pump Displacement (Pcp)
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858 - Pump Flow Rate
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859 - Pump Head Rating
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860 - Pump Output - Gpm
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861 - Pump Output Triplex Pump
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862 - Pump Pressure/pump Stroke Relationship
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863 - Pycnometer Volume Correction
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864 - Quantifying Formation Damage and Improvement
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865 - Radial Force Related to Axial Load - Cementing
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866 - Radiant Heat Transfer Between Disks
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867 - Radiated Energy Flux
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868 - Radiation Across an Annular Gap
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869 - Radiation Shields
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870 - Radius of Investigation
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871 - Radius of Investigation (Flow Time)
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872 - Radius of Investigation (Shut-in Time)
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873 - Range of Load (Sucker-rod Pump)
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874 - Raoult's Law in Glycol Dehydration Unit
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875 - Rate of Advancement of Combustion Front (In-situ Combustion)
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876 - Rate of Fuel Consumption by a Pump
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877 - Rate of Gas Portion That Enters The Mud
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878 - Rate of Growth of Heated Zone in Hot Water Heated Reservoir
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879 - Rate of Growth Per Unit of Exploration Length
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880 - Rate of Oxygen-Reacted Per Unit Mass of Fuel
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881 - Rate of Radioactive Decay
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882 - Ratio of Pore Pressure Change to Original due to Depletion
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883 - Rayleigh Number
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884 - Raymer Hunt Transform (Porosity/transit Time Relationship)
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885 - Recommended Underbalanced Environment for Perforation
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886 - Redlich-Kwong Pvt Equation
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887 - Refrigerator Shaft Speed
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888 - Relation Between Concentration of K,Th, Or U and Recorded Total Gamma Ray Signal
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889 - Relationship Between E_ssp and R_w (Nacl Predominant)
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890 - Relationship Between E_ssp and R_w (Non Ideal Shale Membrane)
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891 - Relationship Between E_ssp and R_w for Water Containing Salts (Other Than Nacl Predominant)
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892 - Relationship Between Rock Resistivity and Water Saturation
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893 - Relationship Between Traveling Block Speed and Fast Line Speed
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894 - Relationship with Real and Dimensionless Time in Hot Water Floods
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895 - Relative Centrifugal Force
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896 - Relative Humidity
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897 - Relative Permeability
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898 - Relative Permeability - Corey Exponents
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899 - Remaining Gas in Place in Coalbed Methane Reservoirs
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900 - Required Oil Length in Separator
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901 - Required Seperator Liquid Section
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902 - Required Water Length in Separator
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903 - Reservoir Flow for Gas Flow in a Formation
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904 - Reservoir Flow Through The Wellbore of a Geothermal Well
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905 - Reservoir Gas Density
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906 - Reservoir Permeability
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907 - Reservoir Wettability Characterization (Rise in Core Method)
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908 - Residence Time of Water in Seperator
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909 - Residence Time Oil in Seperator
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910 - Resistance
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911 - Resistivity
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912 - Resistivity Index - Archie
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913 - Resistivity of a Partially Saturated Shaly Sand with Hydrocarbons (V_sh Models)
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914 - Resistivity of a Water Saturated Shaly Sand (V_sh Models)
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915 - Retention Time in a Liquid-liquid Vessel
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916 - Reynolds Number
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917 - Reynolds Number for Acid Flow into The Fracture (Acidizing)
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918 - Reynolds Number for Fluid Loss (Acidizing)
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919 - Richardson Number
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920 - Roach Plot for Abnormally Pressured Gas Reservoirs
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921 - Rock Conductivity (Clean - Relatively Clean Water Bearing Rocks)
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922 - Rock Expansion Term in Abnormally Pressured Gas Reservoirs
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923 - Rock Removal Rate
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924 - Rotating Horsepower
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925 - Rotation of Maximum Principal Stress Near Wellbore
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926 - Rotation of Maximum Principal Stress Near Wellbore (Zoback & Day-lewis)
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927 - Safety Relief Valves Sizing in Vapor Services
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928 - Sand Weight Needed to Refill a Hydraulically-Fractured Reservoir Volume
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929 - Saturation of Layer under Hot Water Flood
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930 - Schmidt Number
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931 - Shale Compaction
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932 - Shale Index from Gamma Ray Spectrometry
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933 - Shape Factor (Earlougher)
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934 - Shape Factor Expressed As Skin Factor for Vertical Wells
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935 - Shear Modulus
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936 - Shear Modulus (Using Young
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937 - Shear Modulus from Young's Modulus
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938 - Shear Stress in Vertical Borehole
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939 - Shear Stress Near Vertical Well
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940 - Sherwood Number
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941 - Shut-in Time for Pressure Build-up Test (Dietz Method)
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942 - Side Force at Bit in Anisotropic Formation
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943 - Simandoux (Total Shale) Equation
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944 - Simple Interest
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945 - Single Phase Gas Flow (Subsonic)
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946 - Single Phase Liquid Flow Through Choke
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947 - Sinusoidal Buckling
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948 - Skin During Infinite-acting Pseudoradial Flow for Vertical Wells
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949 - Skin Estimation Type-1 (Pressure Build-up Test)
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950 - Skin Factor
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951 - Skin Factor by Hawkins Method
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952 - Skin Factor due to Partial Penetration
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953 - Skin Factor due to Reduced Crushed-zone Permeability
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954 - Skin Factor for a Deviated Well
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955 - Slit Flow in Bingham Fluid
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956 - Slope of Horner Plot in Pressure Buildup Test
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957 - Slope of Pseudosteady-state Flow in Pressure Build-up Test
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958 - Slope of Semilog Plot for Bottom-hole Flowing Pressure Vs Time for Drawdown Test
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959 - Slowness of The Formation
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960 - Slug Calculations (Volume Required)
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961 - Slug Size in Polymer Floods
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962 - Slurry Density for Cementing Calculations
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963 - Smoluchowski Equation
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964 - Solid Content Ratio of Drilling Mud
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965 - Solids Analysis - High-Salt Content Muds
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966 - Solids Analysis Low Salt Content Muds
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967 - Solution Gas Oil Ratio - Beggs-Standing Correlation - P
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968 - Solution Gas Oil Ratio - Standing
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969 - Solution Gas Pure Water Ratio (Rswp)
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970 - Solution Gas Water Ratio
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971 - Somerton Method for Formation Permeability in Coalbed Methane Reservoirs
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972 - Sonic Porosity (Raymer Hunt Gardner Method)
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973 - Spacer Volume Behind Slurry (Required to Balance The Plug)
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974 - Spacing Between Transmitter and Receiver
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975 - Specific Gravity of Air (Upper Phase) (De Nouy Ring Method)
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976 - Specific Gravity of Cuttings (by Using Mud Balance)
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977 - Specific Gravity of Gas Hydrate Forming Components
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978 - Standard Discharge Time for Saybolt Viscosimeter Measurements
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979 - Stanton Number
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980 - Static Self Potential
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981 - Steady State Temperature Controller
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982 - Stefan Boltzmann Law
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983 - Stefan Number
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984 - Still Column Diameter in Glycol Dehydration Unit
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985 - Stokes Number
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986 - Storativity of Fractures
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987 - Stress at Edge of Wellbore Breakout
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988 - Stress Component Near Normal Faulting in Reservoir
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989 - Stress Components in Original Coordinate System in Depletion Drive
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990 - Stress Intensity at Tip of Mode I Fracture
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991 - Stress Path (Induced Normal Faulting)
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992 - Stress Path of Reservoir with Changes in Production
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993 - Stress Perturbation (Segall and Fitzgerald)
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994 - Stripping Factor
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995 - Stripping/Snubbing Calculations (Breakover Point Between Stripping and Snubbing)
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996 - Stripping/Snubbing Calculations - Breakover Point Between Stripping and Snubbing
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997 - Stripping/Snubbing Calculations - Constant BHP with a Gas Bubble Rising
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998 - Stripping/Snubbing Calculations - Height Gain and Casing Pressure from Stripping into Influx
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999 - Stripping/Snubbing Calculations - Maximum Allowable Surface Pressure Governed by Casing Burst Pressure
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1000 - Stripping/Snubbing Calculations - Minimum Surface Pressure before Stripping
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1001 - Stripping/Snubbing Calculations(Height Gain and Casing Pressure from Stripping into Influx)
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1002 - Stripping/Snubbing Calculations(Maximum Allowable Surface Pressure Governed by Casing Burst Pressure)
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1003 - Stripping/Snubbing Calculations(Maximum Allowable Surface Pressure Governed by Formation)
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1004 - Stripping/Snubbing Calculations(Minimum Surface Pressure before Stripping)
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1005 - Stripping/Snubbing Calculations(V for Constant BHP with a Gas Bubble Rising)
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1006 - Stroke Per Minute Required for a Given Annular Velocity
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1007 - Strouhal Number
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1008 - Stuck Pipe Calculations - Method-1
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1009 - Stuck Pipe Calculations - Method-2
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1010 - Subsea Considerations - Adjusting Choke Line Pressure Loss for Higher Mud Weight
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1011 - Subsea Considerations - Casing Burst Pressure-Subsea Stack
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1012 - Subsea Considerations - Casing Pressure Decrease When Bringing Well on Choke
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1013 - Subsea Considerations - Choke Line Pressure Loss
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1014 - Subsea Considerations - Maximum Allowable Mud Weight - Subsea Stack from Leakoff Test
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1015 - Subsea Considerations - Velocity Through Choke Line
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1016 - Subsea Considerations(Adjusting Choke Line Pressure Loss for Higher Mud Weight)
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1017 - Subsea Considerations(Casing Burst Pressure-Subsea Stack)
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1018 - Subsea Considerations(Casing Pressure Decrease When Bringing Well on Choke)
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1019 - Subsea Considerations(Choke Line Pressure Loss)
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1020 - Subsea Considerations(Maximum Allowable Mud Weight,Subsea Stack from Leakoff Test)
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1021 - Subsea Considerations(Velocity Through Choke Line)
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1022 - Subsidence due to Uniform Pore Pressure Reduction in Free Surfaces
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1023 - Sucker Rod- Peak Polished Rod Load
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1024 - Surface Temperature of a Heating Coil
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1025 - Surface Tension from Density
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1026 - Surface Test Pressure Required to Frac The Formation
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1027 - Surge and Swab Pressures
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1028 - Suspension Property of Static Fluids (Completion and Workover Fluids)
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1029 - Tangential Annular Flow of a Power Law Fluid
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1030 - Tarnishing of Metal Surfaces
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1031 - Taylor Dispersion (Axial Dispersion Coefficient)
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1032 - Taylor Equation Viscosity
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1033 - Taylor Number
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1034 - TEG Weight Percent in Glycol Dehydration Unit
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1035 - Temeprature Dependance of Interfacial Tension
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1036 - Temperature after Refrigeration
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1037 - Temperature at Choke Outlet
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1038 - Temperature Dependent Source Rate for Flow Reactor
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1039 - Temperature Distribution in a Hot-wire Anemometer
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1040 - Temperature Distribution in an Embedded Sphere
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1041 - Temperature due to Free Convection
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1042 - Temperature Increase due to Forced Convection
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1043 - Temperature Increase with Time During In-Situ Combustion Process
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1044 - Temperature of a Producing Geothermal Well
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1045 - Temperature of a Single-Phase Liquid Or Gas Injected Geothermal Well
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1046 - Temperature Profile after Viscous Heat Transfer
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1047 - Temperature Profile with a Nuclear Heat Source
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1048 - Temperature Range in Separator
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1049 - Terminal Velocity in a Separator
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1050 - The Film Thickness of a Falling Film
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1051 - The Mass Rate of Flow in a Squared Duct
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1052 - The Z Component of The Force of The Fluid on The Wetted Surface of The Pipe
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1053 - Theory of Diffusion in Collodial Suspensions
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1054 - Thermal Conductivity for Pure Metals
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1055 - Thermal Conductivity of a Polyatomic Gas
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1056 - Thermal Conductivity of Liquids
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1057 - Thermal Conductivity of Polyatomic Gases at Low Density
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1058 - Thermal Conductivity of Solids with Gas Pockets
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1059 - Thermal Diffusivity
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1060 - Thermal Energy of a Fissionable Substance
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1061 - Thermoelastic Effect on Stress
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1062 - Thickness Criteria of Spherical Shells in Separator (ASME)
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1063 - Tilt Angle of Oil Water Angle
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1064 - Time Between The Initiation of The Pulse and The First Arrival Acoustic Energy at The Receiver
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1065 - Time to Pseudo-Steady State (Single Well - Circular Reservoir)
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1066 - Time to Reach The Semi-steady State for a Gas Well in a Circular Or Square Drainage Area
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1067 - Time to The End of Infinite-acting Period for a Well Centered in a Circular Reservoir
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1068 - Time-Average Relation in Compacted Formations (Porosity/Transit Time Relationships)
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1069 - Time-average Relation in Uncompacted Formations (Porosity/transit Time Relationships)
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1070 - Top Distillation Column Rate
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1071 - Torcaso and Wyllie
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1072 - Toricelli Equation
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1073 - Tortuosity (Resistivity Logs)
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1074 - Total Amount of Solids Generated During Drilling
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1075 - Total Compressibility
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1076 - Total Force of The Fluid on The Sphere in a Creeping Flow Around a Sphere
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1077 - Total Heat Energy Consumed by The Engine
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1078 - Total Heat Loss of a Geothermal Well
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1079 - Total Number of Sacks of Tail Sement Required
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1080 - Total Oil Production from In-Situ Combustion - Nelson & McNeil
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1081 - Total Oil Production from Wet In-Situ Combustion - Nelson & McNeil
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1082 - Total Pore Volume Compressibility
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1083 - Total Porosity
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1084 - Total Rock Conductivity
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1085 - Total Skin in Partially Depleted Wells for a Buildup Test
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1086 - Total Water Production from In-Situ Combustion - Nelson & McNeil
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1087 - Total Water Requirement Per Sack of Cement
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1088 - Transmissibility Between Compartments
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1089 - Transmissibility of a Compartment
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1090 - Transmissivity
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1091 - Trapped Gas Volume in The Water-Invaded Zone
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1092 - Triplex Pump Factor
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1093 - True Porosity from Sonic Log (Corrected for Compaction)
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1094 - True Resistivity - Archie
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1095 - True Wellbore Storage Coefficient (Pressure Build-up Test)
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1096 - Two-phase Formation Volume Factor
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1097 - Unconfined Compressive Strength of Rock
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1098 - Underground Fluid Withdrawal by Havlena and Odeh
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1099 - Unit Technical Cost
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1100 - Unsteady Evaporation of a Liquid
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1101 - Upward Force Acting at The Bottom of The Casing Shoe
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1102 - USBM Wettability Index
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1103 - Van Der Waals PVT Equation
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1104 - Vapor Mass Velocity of Tray type Tower
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1105 - Velocity Distribution in a Creeping Flow Around a Sphere
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1106 - Velocity Distribution in The Annular Slit of a Falling-cylinder Viscometer
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1107 - Velocity Distribution in The Narrow Annular Region in Annular Flow with Inner Cylinder Moving Axially
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1108 - Velocity Distribution of a Falling Film with Variable Viscosity
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1109 - Velocity Distribution of Flow Through a Circular Tube
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1110 - Velocity Distribution of Flow Through an Annulus
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1111 - Velocity of Bulk Compressional Waves
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1112 - Velocity of Compression Waves
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1113 - Velocity of Fluid in Annulus
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1114 - Velocity of Fluid in Pipe
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1115 - Velocity of Shear Waves
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1116 - Velocity Profile of Fluids in Flow of Two Adjacent Immiscible Fluids
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1117 - Vertical Core Plug Effective Permeability by Stiles
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1118 - Vertical Curvature for Deviated Wells
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1119 - Vertical Well Critical Rate Correlation by Schols
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1120 - Vertical Well Critical Rate Correlations (Craft and Hawkins Method)
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1121 - Vertical Well Critical Rate Correlations (Hoyland, Papatzacos and Skjaeveland) Isotropic Reservoirs
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1122 - Vertical Well Critical Rate Correlations (Meyer, Gardner and Pirson) - Simultaneous Gas and Water Coning
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1123 - Vertical Well Critical Rate Correlations (Meyer, Gardner and Pirson) for Water Coning
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1124 - Vertical Well Critical Rate Correlations (Meyer, Gardner, and Pirson) for Gas Coning
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1125 - Vertical Well Critical Rate Correlations - Hoyland, Papatzacos and Skjaeveland - Isotropic Reservoirs
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1126 - Viscosibility
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1127 - Viscosity by a Falling-Cylinder Viscometer
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1128 - Viscosity of Crude Oil by Using Api
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1129 - Viscosity of Dead Oil (Standings Correlation)
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1130 - Viscosity of Dead-Oil - Egbogah Correlation - P
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1131 - Viscosity of Live Oil - Beggs/Robinson Correlation
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1132 - Viscosity of Oil - Vasquez/Beggs Correlation - P>Pb
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1133 - Viscosity of Water at Atmospheric Pressure - McCain Correlation
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1134 - Viscosity of Water at Reservoir Pressure - McCain Correlation
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1135 - Viscous Force Acting on The Rod Over The Narrow Annular Region
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1136 - Voltage Required for a Given Temperature Rise in a Wire Heated by an Electric Current
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1137 - Volume Capacity of Pipe
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1138 - Volume of Burned Part of Reservoir (In-situ Combustion)
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1139 - Volume of Cuttings Generated Per Foot of Hole Drilled
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1140 - Volume of Dilution Water Or Mud Required to Maintain Circulating Volume
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1141 - Volume of Fluid Displaced for Duplex Pumps
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1142 - Volume of Fluid Displaced for Single-acting Pump
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1143 - Volume of Fluid Displaced for Triplex Pump
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1144 - Volume of Fluid Loss Per Unit Area Measured in a Dynamic Test (Acidizing)
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1145 - Volume of Fluid Loss Per Unit Area Measured in a Static Test (Acidizing)
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1146 - Volume of Gas Adsorbed in Coalbed Methane Reservoirs
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1147 - Volume of Liquid (Oil Plus Water) Required to Prepare a Desired Volume of Mud
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1148 - Volume of Reservoir Burnt by Wet Combustion
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1149 - Volume of Rock Dissolved Per Unit Volume of Acid (Acidizing)
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1150 - Volume of Slurry Per Sack of Cement
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1151 - Volume of Steam Zone Related to Fraction of Injected Heat by Myhill and Stegemeier
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1152 - Volumes and Strokes (Annular Volume)
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1153 - Volumes and Strokes (Drill String Volume)
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1154 - Volumes and Strokes - Total Strokes
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1155 - Volumetric Heat Capacity
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1156 - Volumetric Heat Capacity of Reservoir
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1157 - Volumetric Photoelectric Absorption Cross Section
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1158 - Vp and Vs Calculation (Eberhart-phillips)
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1159 - Vp and Vs Calculation (Geomechanic Model)
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1160 - Wahl's Method for Relative Permeability Ratio Prediction
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1161 - Wall Thickness Criteria for Separator by Asme (External Radius)
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1162 - Wall Thickness Criteria for Separator by ASME (Internal Radius)
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1163 - Water Breakthrough Correlation in Vertical Wells (Bournazel and Jeanson)
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1164 - Water Breakthrough Correlations in Vertical Wells (Sobocinski and Cornelius)
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1165 - Water Coning in a Vertical Well(Meyer Garder Method)
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1166 - Water Content of Sour Gas
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1167 - Water Cut Through Stiles
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1168 - Water Drive Index for Gas Reservoirs
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1169 - Water Drive Recovery
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1170 - Water Expansion Term in Gas Reservoir
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1171 - Water Expansion Term in Gas Reservoirs
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1172 - Water Formation Volume Factor (McCain Correlation)
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1173 - Water Formation Volume Factor - McCain Correlation
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1174 - Water Influx (Pot Aquifer Model)
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1175 - Water Influx Constant for The Van Everdingen and Hurst Unsteady-state Model
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1176 - Water Loading in Adsorption Unit
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1177 - Water Quantity That Dilutes The Original Brine with Assumed Density (Two-Salt Systems)
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1178 - Water Salinity Index Ratio
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1179 - Water Saturation Determination (Ie and Cdn Logs)
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1180 - Water Saturation from Neutron Tools
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1181 - Water Saturation- Resistivity Logs
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1182 - Water Two Phase Formation Volume Factor
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1183 - Wavelength Equation
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1184 - Waxman and Smits Model (for Clean Sands)
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1185 - Weight of Additive Per Sack of Cement
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1186 - Weight of Crystalline CaCl2 and CaBr2 Salt Addition to Brine (Two-Salt Systems)
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1187 - Weight of Rich Teg in Glycol Dehydration Unit
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1188 - Weighted Cementing Calculations
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1189 - Welge Extension (Fractional Flow)
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1190 - Well Effective Wellbore Radius of a Horizontal - Method 1- Anisotropic Reservoirs
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1191 - Well Flow Efficiency (Geothermal Well)
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1192 - Well Flowing Pressure (Line Source Solution by Including Skin Factor)
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1193 - Well Flowing Pressure (Outflow Performance Relationship)
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1194 - Well Flowing Pressure under Pseudosteady-state Flow for Non-circular Reservoirs
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1195 - Well Shut-in Pressure During Build-up (Horner Plot)
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1196 - Well Shut-in Pressure in Partial Depleted Wells
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1197 - Wellbore Electric Voltage Generation
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1198 - Wellbore Pressure Loss due to Friction During Hydraulic Fracturing (Laminar Flow)
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1199 - Wellbore Pressure Loss due to Friction During Hydraulic Fracturing (Turbulence Flow)
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1200 - Wellbore Storage
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1201 - Wellbore Storage (Well with a Liquid Interface)
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1202 - Wellbore Storage Coefficient
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1203 - Wellbore Storage due to Fluid Level
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1204 - Wellhead Pressure (Multiphase Flow Across The Choke)
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1205 - Wet Combustion Design (in Situ Combustion)
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1206 - Whitson Equation for Critical Pressure
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1207 - Wien Displacement Law
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1208 - Wind Force Acting on an Offshore Vessel
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1209 - Winsauer Equation
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1210 - Witherspoon's Equation for Laminar Flow in Fractures
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1211 - Wobbe Index
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1212 - Work Done by Expansion Tube Refrigerator
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1213 - Workover Operations (Maximum Allowed Tubing Pressure)
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1214 - Wyllie's Time Average Equation
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1215 - Yearly after Tax Cash Flow
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1216 - Yield of Clays As Drilling Fluids
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1217 - Yield Strength (Bingham Plastic Model)
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1218 - Young Modulus by Using Sonic Travel Time (Acidizing)
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1219 - Young's Modulus(Using Poisson's Ratio and Shear Modulus)
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