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Complete petroleum engineering catalog
Each record links to both an interactive calculator and a formula reference page with variables, units, source notes, and review status.
Drilling Engineering
266 calculators and formula references.
Directional Drilling
- Average Angle Survey DisplacementsCalculatorFormula
- Balanced Tangential Survey DisplacementsCalculatorFormula
- Borehole Torsion by Cylindrical Helical MethodCalculatorFormula
- Build or Drop Rate from Inclination ChangeCalculatorFormula
- Build Rate Component from Dogleg Severity and ToolfaceCalculatorFormula
- Build Section Measured Depth from Build RateCalculatorFormula
- Closure Distance and DirectionCalculatorFormula
- Curvature Radius for a BoreholeCalculatorFormula
- Directional Curvature for a Deviated WellCalculatorFormula
- Dogleg Angle - Minimum Curvature MethodCalculatorFormula
- Dogleg Severity - Minimum Curvature MethodCalculatorFormula
- EOU Clearance Distance for Wellbore Collision AvoidanceCalculatorFormula
- Horizontal Section Inclination from Bed Dip and ThicknessCalculatorFormula
- Horizontal Wellbore Center-to-Center SeparationCalculatorFormula
- Kickoff Point from Target TVD and Build SectionsCalculatorFormula
- Maximum Slanted Well Length in Reservoir ThicknessCalculatorFormula
- Minimum Allowable Separation Distance from Separation FactorCalculatorFormula
- Minimum Curvature Ratio FactorCalculatorFormula
- Minimum Curvature Survey DisplacementsCalculatorFormula
- Projected Turn Rate from Azimuth ChangeCalculatorFormula
- Radius of Curvature from Dogleg SeverityCalculatorFormula
- Radius-of-Curvature Build Section DepartureCalculatorFormula
- Radius-of-Curvature Build Section TVD GainCalculatorFormula
- Required Dogleg Severity from Build and Turn ComponentsCalculatorFormula
- Sliding Percentage from Required and Motor Dogleg SeverityCalculatorFormula
- Tangential Survey DisplacementsCalculatorFormula
- Target TVD Increase from Bed Dip and DepartureCalculatorFormula
- Three-Dimensional Wellbore Center-to-Center SeparationCalculatorFormula
- Toolface Angle from Build and Turn ComponentsCalculatorFormula
- Turn Rate Component from Dogleg Severity and ToolfaceCalculatorFormula
- Vertical Curvature for Deviated WellsCalculatorFormula
- Wellbore Separation Factor from EOU RadiiCalculatorFormula
- Wellbore Separation Ratio to Minimum Allowable DistanceCalculatorFormula
Drilling Hydraulics
- Annular Capacity - bbl/ftCalculatorFormula
- Annular Capacity - gal/ftCalculatorFormula
- Annular Capacity Between Casing and Multiple Strings of TubingCalculatorFormula
- Annular Velocity from Pump OutputCalculatorFormula
- Annular Volume Capacity of PipeCalculatorFormula
- Apparent Viscosity from 600 RPM ReadingCalculatorFormula
- Bit Nozzle Impact ForceCalculatorFormula
- Bit Nozzle Jet VelocityCalculatorFormula
- Bit Nozzle Pressure LossCalculatorFormula
- Bit-to-Surface Lag Time from Annular VolumeCalculatorFormula
- Critical Flow Rate for Flow Regime ChangeCalculatorFormula
- Cuttings Carrying Capacity IndexCalculatorFormula
- Cuttings Net Rise VelocityCalculatorFormula
- Cuttings Slip VelocityCalculatorFormula
- Depth of a Washout - Method 1CalculatorFormula
- Depth of a Washout - Method 2CalculatorFormula
- Drill Pipe or Drill Collar CapacityCalculatorFormula
- Drill Pipe or Drill Collar Displacement and WeightCalculatorFormula
- Drill String VolumeCalculatorFormula
- Duplex Pump Output per StrokeCalculatorFormula
- Duplex Pump Output Rate with Volumetric EfficiencyCalculatorFormula
- Equivalent Circulating DensityCalculatorFormula
- Hydraulic Horsepower at BitCalculatorFormula
- Hydraulic Horsepower per Unit Bit AreaCalculatorFormula
- Impact Force per Unit Bit AreaCalculatorFormula
- Linear Annular Capacity of PipeCalculatorFormula
- Linear Pipe CapacityCalculatorFormula
- Maximum Drilling Rate for Larger HolesCalculatorFormula
- New Pump Circulating PressureCalculatorFormula
- New Pump Circulating Pressure - Square LawCalculatorFormula
- New Pump Circulating Pressure with Friction ExponentCalculatorFormula
- Nozzle Area from Three Jet SizesCalculatorFormula
- Open-Ended Displacement Volume of PipeCalculatorFormula
- Overall Diesel-to-Mud-Pump EfficiencyCalculatorFormula
- Overall Power System EfficiencyCalculatorFormula
- Percentage Pressure Loss at BitCalculatorFormula
- Plastic Viscosity from 600 and 300 RPM ReadingsCalculatorFormula
- Power Law Consistency Index from 300 RPM ReadingCalculatorFormula
- Power Law Flow Behavior Index from Rheometer ReadingsCalculatorFormula
- Pump Input Power from Fuel Consumption RateCalculatorFormula
- Pump Pressure Exponent from Two Pump TestsCalculatorFormula
- Pump Pressure from Bit Drop and Friction LossesCalculatorFormula
- Strokes per Minute Required for Target Annular VelocityCalculatorFormula
- Total Circulation Strokes from Drillstring and Annular VolumeCalculatorFormula
- Triplex Pump Output per StrokeCalculatorFormula
- Triplex Pump Output Rate with Volumetric EfficiencyCalculatorFormula
- Tubular and Open-Hole CapacityCalculatorFormula
- Velocity of Fluid in AnnulusCalculatorFormula
- Yield Point from 600 and 300 RPM ReadingsCalculatorFormula
Drilling Operations and Economics
- Bit Run Drilling Cost per FootCalculatorFormula
- Control Drilling Maximum Drilling RateCalculatorFormula
- D-Exponent from Drilling ParametersCalculatorFormula
- Detailed Drilling Cost per FootCalculatorFormula
- Drill-Rate Model Penetration RateCalculatorFormula
- Drilled Gas Entry RateCalculatorFormula
- Gas Mud Ratio from Drilled GasCalculatorFormula
- Gas Portion Entry Rate from Rock RemovalCalculatorFormula
- Hydromechanical Specific EnergyCalculatorFormula
- Mechanical Specific EnergyCalculatorFormula
- Rock Removal Rate from Bit Diameter and ROPCalculatorFormula
- Rotary-Speed Drill-Rate Model Penetration RateCalculatorFormula
- Rotating Horsepower from Torque and SpeedCalculatorFormula
Drillstring and Rig Mechanics
- Bottomhole Assembly Length for Desired Weight on BitCalculatorFormula
- Coring Operation Ton MilesCalculatorFormula
- Crown Block CapacityCalculatorFormula
- Drilling and Connection Ton MilesCalculatorFormula
- Drillstring Buoyancy Factor from Mud WeightCalculatorFormula
- Effective Drillstring Weight During DrillingCalculatorFormula
- Efficiency of Block and Tackle SystemCalculatorFormula
- Maximum Equivalent Derrick LoadCalculatorFormula
- Maximum Length of Drillpipe for a Specific Bottomhole AssemblyCalculatorFormula
- Maximum Weight on BitCalculatorFormula
- Round Trip Ton MilesCalculatorFormula
- Setting Casing Ton MilesCalculatorFormula
- Short Trip Ton MilesCalculatorFormula
- Stretch Force from Elastic ElongationCalculatorFormula
- Stuck Pipe Free Point from Pipe Stretch - Method 1CalculatorFormula
- Stuck Pipe Free Point from Pipe Stretch - Method 2CalculatorFormula
- Traveling Block Speed from Fast Line SpeedCalculatorFormula
Mud and Cementing
- Annular Cement Volume for Casing SectionCalculatorFormula
- Annular Spacer Volume for Casing JobCalculatorFormula
- API Water Loss from Seven-and-a-Half Minute FiltrateCalculatorFormula
- Area Below the Casing ShoeCalculatorFormula
- Balanced Cement Plug Length Before Pipe WithdrawalCalculatorFormula
- Casing Displacement Volume to Float CollarCalculatorFormula
- Cement Height in Annulus from Slurry VolumeCalculatorFormula
- Cement Plug Landing Differential PressureCalculatorFormula
- Cement Plug Landing Upward ForceCalculatorFormula
- Cement Plug Sacks Required for Planned LengthCalculatorFormula
- Cement Plug Slurry Volume from SacksCalculatorFormula
- Cement Remaining in Casing Above Cementing ToolCalculatorFormula
- Cement Sacks Required from Slurry VolumeCalculatorFormula
- Cement Slurry Hydrostatic Pressure at DepthCalculatorFormula
- Cement Slurry Pressure Gradient from DensityCalculatorFormula
- Cement Slurry Yield from Slurry VolumeCalculatorFormula
- Centrifuge Mud Processing EvaluationCalculatorFormula
- Combined Solubility of Hydrocarbon Gas, CO2, and H2S in a Mud ComponentCalculatorFormula
- Cuttings Volume Generated per Foot DrilledCalculatorFormula
- Difference in Pressure Gradient Between Cement and MudCalculatorFormula
- Differential Hydrostatic Pressure Between Cement Annulus and Mud in CasingCalculatorFormula
- Dilution Volume to Maintain Circulating Low-Gravity SolidsCalculatorFormula
- Displacement Strokes to Bump Cement PlugCalculatorFormula
- Drilling Mud Density - Solid Content Analysis of Drilling MudsCalculatorFormula
- Filtration Rate for API Fluid Loss MeasurementCalculatorFormula
- Filtration Volume with Spurt LossCalculatorFormula
- Gas Solubility in a Mud SystemCalculatorFormula
- Hydrocyclone Solids Removal EvaluationCalculatorFormula
- Increase Mud Density by BariteCalculatorFormula
- Increase Mud Density by Calcium CarbonateCalculatorFormula
- Increase Mud Density by HematiteCalculatorFormula
- Increase Volume by BariteCalculatorFormula
- Increase Volume by Calcium CarbonateCalculatorFormula
- Increase Volume by HematiteCalculatorFormula
- Initial Volume Required with BariteCalculatorFormula
- Initial Volume Required with Calcium CarbonateCalculatorFormula
- Initial Volume Required with HematiteCalculatorFormula
- Internal Hydrostatic Pressure While Landing Cement PlugCalculatorFormula
- Lateral Load Imposed on a Casing CentralizerCalculatorFormula
- Lateral Load Imposed on a Casing Centralizer with a DoglegCalculatorFormula
- Lead Cement Sacks Required in AnnulusCalculatorFormula
- Load to Break Cement BondCalculatorFormula
- Maximum Recommended Low-Gravity SolidsCalculatorFormula
- Maximum Recommended Solids Fraction in Drilling FluidCalculatorFormula
- Mud Volume Required to Spot Balanced Cement PlugCalculatorFormula
- Mud Weight Increase Required to Balance PressureCalculatorFormula
- Mud Weight Reduction by DilutionCalculatorFormula
- Optimal Solids Removal EfficiencyCalculatorFormula
- Pressure Required to Overcome Mud Gel Strength in AnnulusCalculatorFormula
- Pressure Required to Overcome Mud Gel Strength Inside Drill StringCalculatorFormula
- Radial Force Related to Axial Load in Cementing SlipsCalculatorFormula
- Resulting Force After Casing Cementing JobCalculatorFormula
- Slurry Density for Cementing CalculationsCalculatorFormula
- Solid Content Ratio of Drilling MudCalculatorFormula
- Solids Analysis for High-Salt Content MudsCalculatorFormula
- Solids Buildup in Mud SystemCalculatorFormula
- Solids Control EfficiencyCalculatorFormula
- Spacer Contact Time from Turbulent-Flow VolumeCalculatorFormula
- Spacer Volume Behind Slurry to Balance Cement PlugCalculatorFormula
- Specific Gravity of Cuttings by Mud BalanceCalculatorFormula
- Tail Cement Sacks Required in AnnulusCalculatorFormula
- Tail Cement Sacks Required in CasingCalculatorFormula
- Top of Cement Depth from Annular Cement HeightCalculatorFormula
- Total Required Mixing Water for Cement JobCalculatorFormula
- Total Solids Generated While DrillingCalculatorFormula
- Total Tail Cement Sacks RequiredCalculatorFormula
- Total Water Requirement per Sack of CementCalculatorFormula
- Upward Force at the Bottom of the Casing ShoeCalculatorFormula
- Volume of Liquid Oil plus Water Required to Prepare a Desired Volume of MudCalculatorFormula
- Volume of Slurry per Sack of CementCalculatorFormula
- Weight of Additive per Sack of CementCalculatorFormula
- Yield of Clays as Drilling FluidsCalculatorFormula
Well Control
- Accumulator Bottles Required for BOP Function VolumeCalculatorFormula
- Accumulator Nitrogen Gas Volume from Boyle LawCalculatorFormula
- Actual Gas Migration Rate from Casing Pressure IncreaseCalculatorFormula
- Additional Mud Returned by SlugCalculatorFormula
- Breakover Point Between Stripping and SnubbingCalculatorFormula
- Brine Fluid Density to Mix for Temperature CorrectionCalculatorFormula
- Bullhead Pump Speed to Exceed Gas MigrationCalculatorFormula
- Bullheading Formation Fracture Pressure from GradientCalculatorFormula
- Bullheading Initial Average Fluid DensityCalculatorFormula
- Bullheading Initial Hydrostatic Pressure from Formation PressureCalculatorFormula
- Bullheading Maximum Final Surface PressureCalculatorFormula
- Bullheading Maximum Initial Surface PressureCalculatorFormula
- Bullheading Volume to PerforationsCalculatorFormula
- Casing Pressure After Subsea Start-UpCalculatorFormula
- Casing Pressure Increase from Stripping Into InfluxCalculatorFormula
- Casing Pressure Increase Rate from Gas MigrationCalculatorFormula
- Closed-Ended Pipe Buoyed Weight with No Fluid InsideCalculatorFormula
- Constant Bottomhole Pressure Bleed Volume for Rising GasCalculatorFormula
- Dry Pipe Pulled Before Fill-Up for Pressure DropCalculatorFormula
- Equivalent Mud Weight from Surface PressureCalculatorFormula
- Final Circulating PressureCalculatorFormula
- Formation Integrity Test PressureCalculatorFormula
- Height Gain from Stripping Into InfluxCalculatorFormula
- Hydraulic Force from Pressure and DiameterCalculatorFormula
- Hydrostatic Pressure Decrease Due to Gas-Cut MudCalculatorFormula
- Hydrostatic Pressure Drop per Foot Pulling Dry PipeCalculatorFormula
- Hydrostatic Pressure Drop per Foot Pulling Wet PipeCalculatorFormula
- Hydrostatic Pressure from Mud WeightCalculatorFormula
- Hydrostatic Pressure in Annulus Due to SlugCalculatorFormula
- Initial Circulating PressureCalculatorFormula
- Kick Analysis - Formation Pressure With Well Shut-InCalculatorFormula
- Kick Analysis - Height of InfluxCalculatorFormula
- Kick Analysis - Influx DensityCalculatorFormula
- Kick Analysis - Maximum Pit Gain From Gas KickCalculatorFormula
- Kick Analysis - Shut-In Drill Pipe PressureCalculatorFormula
- Kick Tolerance Bottomhole Gas VolumeCalculatorFormula
- Kill Weight Mud Determination - Moore EquationCalculatorFormula
- Level Drop After Pumping a SlugCalculatorFormula
- Maximum Allowable Annular Surface Pressure from Shoe EMWCalculatorFormula
- Maximum Allowable Mud Weight From Leak-Off PressureCalculatorFormula
- Maximum Allowable Surface Pressure Governed by Casing BurstCalculatorFormula
- Maximum Surface Pressure From Gas Kick in Water-Based MudCalculatorFormula
- Minimum Surface Pressure Before StrippingCalculatorFormula
- Mud Pressure Gradient from Mud WeightCalculatorFormula
- New MAASP After Kill Mud WeightCalculatorFormula
- New Pump Pressure with Mud Weight ChangeCalculatorFormula
- Open-Ended Pipe Buoyed WeightCalculatorFormula
- Pore Pressure Gradient - Rehm and McClendonCalculatorFormula
- Pore Pressure Gradient - ZamoraCalculatorFormula
- Pressure by Each Barrel of Mud in CasingCalculatorFormula
- Rectangular Tank Capacity per FootCalculatorFormula
- Rectangular Tank Capacity per InchCalculatorFormula
- Rectangular Tank VolumeCalculatorFormula
- Riser Hydrostatic Loss on DisconnectCalculatorFormula
- Riser Margin from Hydrostatic LossCalculatorFormula
- Shut-In Pressure Increase from Gas Migration TimeCalculatorFormula
- Specific Gravity to Fluid WeightCalculatorFormula
- Stored Hydraulic Fluid Volume in Accumulator BottleCalculatorFormula
- Subsea Choke Line Pressure LossCalculatorFormula
- Subsea Choke Line Pressure Loss Adjusted for Mud WeightCalculatorFormula
- Subsea Choke Line VelocityCalculatorFormula
- Subsea Maximum Allowable Mud Weight from Leakoff TestCalculatorFormula
- Subsea Stack Casing Burst PressureCalculatorFormula
- Surface Pressure During Drill Stem TestCalculatorFormula
- Surface Test Pressure Required to Frac the FormationCalculatorFormula
- Surface-to-Bit Strokes for Wait and Weight ScheduleCalculatorFormula
- Time to MAASP During Gas MigrationCalculatorFormula
- Total Mud Returned by SlugCalculatorFormula
- Total Usable Fluid Volume from Accumulator BankCalculatorFormula
- Trip Margin from Yield Point and Annular ClearanceCalculatorFormula
- Tubular Buoyed Weight with Different Internal and Annular FluidsCalculatorFormula
- Usable Fluid Volume per Surface Accumulator BottleCalculatorFormula
- Vertical Cylindrical Tank Capacity per FootCalculatorFormula
- Vertical Cylindrical Tank VolumeCalculatorFormula
- Volumetric Mud Bleed from Allowed Pressure RiseCalculatorFormula
- Wait and Weight Drill Pipe Pressure at Schedule StrokesCalculatorFormula
- Wait and Weight Pressure Drop over Stroke IntervalCalculatorFormula
- Wait and Weight Pressure Drop per StrokeCalculatorFormula
- Wet Pipe Pulled Before Fill-Up for Pressure DropCalculatorFormula
- Workover Buoyancy Factor from Fluid WeightCalculatorFormula
- Workover Kill Fluid Weight from Bottomhole PressureCalculatorFormula
- Workover Kill Fluid Weight from Shut-In Tubing PressureCalculatorFormula
Geomechanics and Fracturing
90 calculators and formula references.
In-Situ Stress and Rock Mechanics
- Bulk Modulus from Lame Constant and Poisson RatioCalculatorFormula
- Bulk Modulus from Lame Constant and Shear ModulusCalculatorFormula
- Bulk Modulus from Pressure and Volume StrainCalculatorFormula
- Bulk Modulus from Shear Modulus and Poisson RatioCalculatorFormula
- Bulk Modulus from Young's Modulus and Poisson RatioCalculatorFormula
- Classic Breakdown Pressure for a Vertical WellboreCalculatorFormula
- Compressional and Shear Wave Velocities from Elastic ModuliCalculatorFormula
- Drilling-Induced Tensile Fracture MarginCalculatorFormula
- Eaton Minimum Horizontal Stress Fracture PressureCalculatorFormula
- Eaton Pore Pressure Gradient from Corrected D-ExponentCalculatorFormula
- Eaton Pore Pressure Gradient from Resistivity RatioCalculatorFormula
- Eaton Pore Pressure Gradient from Sonic Transit TimeCalculatorFormula
- Effect of Pore Pressure on StressCalculatorFormula
- Effective Stress on Individual GrainsCalculatorFormula
- Failure Criteria - Mohr-Coulomb Stress ComponentsCalculatorFormula
- Formation Compressibility from Hydrofrac DataCalculatorFormula
- Fracture Gradient - Zoback and HealyCalculatorFormula
- Fracture Pressure - Hubbert and WillisCalculatorFormula
- Hoek and Brown Criteria for Principal Stress FailureCalculatorFormula
- Horizontal Effective Stress - Lorenz and TeufelCalculatorFormula
- Horizontal Maximum Stress - BredehoeftCalculatorFormula
- Induced Fracture DipCalculatorFormula
- Initial Effective Horizontal StressCalculatorFormula
- Isothermal Compressibility of Limestones - Newman CorrelationCalculatorFormula
- Least Principal Stress - Matthews and KellyCalculatorFormula
- Linearized Mohr Failure LineCalculatorFormula
- Linearized Mohr-Coulomb CriteriaCalculatorFormula
- M Modulus from Shear and Bulk ModulusCalculatorFormula
- M Modulus from Young's Modulus and Poisson RatioCalculatorFormula
- Matthews-Kelly Fracture Gradient from Stress RatioCalculatorFormula
- Maximum Hoop Stress at the Wellbore WallCalculatorFormula
- Maximum Horizontal Stress from Wellbore Breakout WidthCalculatorFormula
- Maximum Principal Stress in Normal FaultingCalculatorFormula
- Maximum Principal Stress in Reverse FaultingCalculatorFormula
- Maximum Principal Stress in Strike-Slip FaultingCalculatorFormula
- Minimum Axial Stress at a Vertical WellboreCalculatorFormula
- Minimum Hoop Stress at the Wellbore WallCalculatorFormula
- Minimum Mud Pressure to Avoid Wellbore BreakoutCalculatorFormula
- Mode I Fracture Stress IntensityCalculatorFormula
- Modified Eaton Pore Pressure Gradient from Specific EnergyCalculatorFormula
- Modified Lade Failure CriterionCalculatorFormula
- Mody-Hale Osmotic Pore-Pressure Increase from Molar VolumeCalculatorFormula
- Mud Pressure for Target Breakout WidthCalculatorFormula
- Normal Hoop Stress at the Wellbore WallCalculatorFormula
- Normal Radial Stress Near a WellboreCalculatorFormula
- Normal Tangential Hoop Stress Near a WellboreCalculatorFormula
- Pore Pressure Increase Due to Fluid Activity Mody and HaleCalculatorFormula
- Pore Pressure of Shale FlemingsCalculatorFormula
- Pore Pressure of Shale TraugottCalculatorFormula
- Pressure to Grow Fractures - Abe, Mura et al.CalculatorFormula
- Radial Stress Around a Vertical WellboreCalculatorFormula
- Ratio of Pore Pressure Change to Original Due to DepletionCalculatorFormula
- Reservoir Stress Path from Biot Coefficient and Poisson RatioCalculatorFormula
- Rotation of Maximum Principal Stress Near WellboreCalculatorFormula
- Rotation of Maximum Principal Stress Zoback Day LewisCalculatorFormula
- Shale CompactionCalculatorFormula
- Shear Modulus from Force Area and Deformation AngleCalculatorFormula
- Shear Modulus from Young's Modulus and Poisson RatioCalculatorFormula
- Shear Wave Velocity from Shear Modulus and DensityCalculatorFormula
- Stress Components in Original Coordinate System in Depletion DriveCalculatorFormula
- Stress Components Near Normal Faulting in ReservoirCalculatorFormula
- Stress Path for Induced Normal FaultingCalculatorFormula
- Stress Perturbation Segall and FitzgeraldCalculatorFormula
- Subsidence Due to Uniform Pore Pressure Reduction in Free SurfacesCalculatorFormula
- Tangential Stress Extremes at a Deviated WellboreCalculatorFormula
- Tensile Breakdown Pressure with Thermal StressCalculatorFormula
- Thermal Hoop Stress from Wellbore Temperature ChangeCalculatorFormula
- Twisting Stress Around a Vertical WellboreCalculatorFormula
- Unconfined Compressive Strength of RockCalculatorFormula
- Velocity of Bulk Compressional WavesCalculatorFormula
- Weak-Plane Anisotropic Failure StressCalculatorFormula
- Wellbore Breakout Width from Mud PressureCalculatorFormula
Naturally Fractured Reservoirs
- Areal Fracture Intensity from Trace LengthCalculatorFormula
- Average Fracture Spacing from Linear IntensityCalculatorFormula
- Cubic Matrix Block Interporosity Flow CoefficientCalculatorFormula
- Fracture Permeability from Hydraulic Aperture Cubic LawCalculatorFormula
- Fracture Porosity from Aperture and Volumetric IntensityCalculatorFormula
- Fracture StorativityCalculatorFormula
- Kazemi Rectangular Matrix-Block Shape FactorCalculatorFormula
- Lim-Aziz Anisotropic Rectangular Matrix-Block Shape FactorCalculatorFormula
- Linear Fracture Intensity from Scanline CountCalculatorFormula
- Matrix Block Shape Factor from Surface AreaCalculatorFormula
- Matrix-Block Shape Factor from Dimensionless ConstantCalculatorFormula
- Parallel Fracture Set Permeability from Cubic LawCalculatorFormula
- Single-Fracture Flow Rate from Cubic LawCalculatorFormula
- Slab Matrix Block Interporosity Flow CoefficientCalculatorFormula
- Spherical Matrix Block Interporosity Flow CoefficientCalculatorFormula
- Volumetric Fracture Intensity from Fracture AreaCalculatorFormula
- Warren-Root Interporosity Flow CoefficientCalculatorFormula
- Warren-Root Shape Factor from Fracture SetsCalculatorFormula
Petrophysics
132 calculators and formula references.
Electrical Properties
- Apparent ResistivityCalculatorFormula
- Archie Cementation Exponent from Formation FactorCalculatorFormula
- Archie Formation Factor from PorosityCalculatorFormula
- Archie Resistivity Index from Water SaturationCalculatorFormula
- Archie True Formation ResistivityCalculatorFormula
- Archie Water Saturation from Formation FactorCalculatorFormula
- Diffuse-Layer Thickness from Salt ConcentrationCalculatorFormula
- Dual-Water Brine-Saturated Rock ConductivityCalculatorFormula
- Effect of Clay on ConductivityCalculatorFormula
- Electric Resistance to Radial Current from a WellboreCalculatorFormula
- Electrical Conductivity from ResistivityCalculatorFormula
- Electrical Resistivity from Resistance GeometryCalculatorFormula
- Electrochemical Potential - SP LogCalculatorFormula
- Electrode Array Geometric CoefficientCalculatorFormula
- Electrokinetic Potential Across Mud CakeCalculatorFormula
- Formation Factor from Water-Filled Rock ResistivityCalculatorFormula
- Formation Water Resistivity from Resistivity Ratio MethodCalculatorFormula
- Generalized Archie Formation Factor with Lithology CoefficientCalculatorFormula
- Lateral Device Geometric CoefficientCalculatorFormula
- Membrane Potential for SP LogCalculatorFormula
- Non-Ideal Shale Membrane Efficiency from Shale ResistivityCalculatorFormula
- Non-NaCl Static Self Potential from Ion ActivitiesCalculatorFormula
- Normal Sonde Geometric CoefficientCalculatorFormula
- Relationship Between SSP and Rw - NaCl PredominantCalculatorFormula
- Resistivity Bed Reflection CoefficientCalculatorFormula
- Resistivity Index from True and Water-Filled ResistivityCalculatorFormula
- Rock Conductivity for Clean Water-Bearing RocksCalculatorFormula
- Static Self Potential from NaCl ActivitiesCalculatorFormula
- Static Spontaneous Potential from Equivalent ResistivitiesCalculatorFormula
- Total Rock Conductivity from Water SaturationCalculatorFormula
- Waxman-Smits Clean-Sand Brine-Saturated Rock ConductivityCalculatorFormula
- Wellbore Electric Voltage GenerationCalculatorFormula
Resistivity Logs
- Archie Flushed-Zone Water Saturation from Shallow ResistivityCalculatorFormula
- Archie Water Saturation from Resistivity LogsCalculatorFormula
- Arps Formation Water Resistivity Temperature CorrectionCalculatorFormula
- Bulk Volume Water from Porosity and Water SaturationCalculatorFormula
- Carothers Formation Factor - Calcareous SandsCalculatorFormula
- Carothers Formation Factor - Shaly SandsCalculatorFormula
- Chalky Carbonate Formation Factor from PorosityCalculatorFormula
- Chevron Formation Factor from PorosityCalculatorFormula
- Compacted Carbonate Formation Factor from PorosityCalculatorFormula
- Equivalent Formation Water Resistivity from SPCalculatorFormula
- Fertl-Hammack Shaly Sand Water SaturationCalculatorFormula
- Flushed-Zone Apparent Formation Factor from Apparent SaturationCalculatorFormula
- Flushed-Zone Water Saturation from Formation FactorCalculatorFormula
- Formation Factor - Archie's EquationCalculatorFormula
- Formation Resistivity and Permeability - Carothers LimestonesCalculatorFormula
- Formation Resistivity and Permeability - Carothers SandstonesCalculatorFormula
- Hingle Crossplot True ResistivityCalculatorFormula
- Humble Formation Factor from PorosityCalculatorFormula
- Indonesian Water Saturation from Shaly Sand LogsCalculatorFormula
- Movable Hydrocarbon Saturation from Flushed ZoneCalculatorFormula
- Mud Cake Resistivity from Mud and Filtrate ResistivityCalculatorFormula
- Mud Filtrate Resistivity from Mud ResistivityCalculatorFormula
- Oil Saturation from IE and CDN Resistivity LogsCalculatorFormula
- Partially Saturated Shaly Sand Resistivity Vsh ModelCalculatorFormula
- Phillips Formation Factor - Average SandsCalculatorFormula
- Pickett Crossplot Log True ResistivityCalculatorFormula
- Porter-Carothers Formation Factor - California Pliocene LogsCalculatorFormula
- Porter-Carothers Formation Factor - Gulf Coast Miocene LogsCalculatorFormula
- Residual Hydrocarbon Saturation from Flushed ZoneCalculatorFormula
- Resistivity Index - Archie's LawCalculatorFormula
- Sethi Formation Factor - Clean Granular FormationsCalculatorFormula
- Shell Formation Factor - Low-Porosity CarbonatesCalculatorFormula
- Simandoux Total Shale EquationCalculatorFormula
- Simandoux Water Saturation from Shaly Sand LogsCalculatorFormula
- Tortuosity from Resistivity Log Path LengthsCalculatorFormula
- Water Salinity Index RatioCalculatorFormula
- Water Saturation from IE and CDN Resistivity LogsCalculatorFormula
- Water Saturation from Neutron Capture Cross SectionCalculatorFormula
- Water-Saturated Shaly Sand Resistivity Vsh ModelCalculatorFormula
Rock Properties
- Acoustic Transit TimeCalculatorFormula
- Adhesion Tension from Water-Oil Interfacial TensionCalculatorFormula
- Air Density for de Nouy Upper Phase CorrectionCalculatorFormula
- Amott-Harvey Wettability IndexCalculatorFormula
- Amplitude Transmission Coefficient in Seismic Reflection and RefractionCalculatorFormula
- Apparent Gamma Ray Recorder IntensityCalculatorFormula
- Apparent Interfacial Tension - de Nouy Ring MethodCalculatorFormula
- Atlas Wireline Neutron Lifetime LogCalculatorFormula
- Clavier Shale Volume from Gamma Ray IndexCalculatorFormula
- Coates NMR Permeability from Free-Fluid RatioCalculatorFormula
- Composite Capture Cross Section of the Formation Schlumberger Thermal Decay Time ToolCalculatorFormula
- Contact Angle from Interfacial TensionsCalculatorFormula
- Corrected Interfacial Tension - de Nouy Ring MethodCalculatorFormula
- de Nouy Ring Interfacial Tension Correction FactorCalculatorFormula
- Density Log Porosity from Bulk DensityCalculatorFormula
- Effective Photoelectric Absorption Cross Section IndexCalculatorFormula
- Electron Density Index for Gamma-Gamma Absorption LoggingCalculatorFormula
- Epithermal Neutron Diffusion CoefficientCalculatorFormula
- Epithermal Neutron Flux DistributionCalculatorFormula
- Error Percentage of Porosity MeasurementsCalculatorFormula
- Fraction of Total Porosity Occupied by ClaysCalculatorFormula
- Fresh Water-Filled Porosity - LimestonesCalculatorFormula
- Gamma Ray Log Shale IndexCalculatorFormula
- Gas-Effect Corrected Porosity from Neutron-Density LogsCalculatorFormula
- Half Thickness ValueCalculatorFormula
- Integrated Radial Geometric FactorCalculatorFormula
- Larionov Older-Rock Shale Volume from Gamma Ray IndexCalculatorFormula
- Larionov Tertiary-Rock Shale Volume from Gamma Ray IndexCalculatorFormula
- Linear Absorption Attenuation CoefficientCalculatorFormula
- Liquid Permeability - Permeameter Lab MeasurementCalculatorFormula
- Mean Free Path Photon AbsorptionCalculatorFormula
- Neutron Lethargy Logarithmic Energy DecrementCalculatorFormula
- Neutron Porosity in a Shaly FormationCalculatorFormula
- NMR Free-Fluid Index from Porosity PartitionCalculatorFormula
- Pair Production Gamma Ray InteractionsCalculatorFormula
- Photoelectric Absorption Cross Sectional AreaCalculatorFormula
- Poissons Ratio Seismic Arrival Time MethodCalculatorFormula
- Porosity from Neutron Flux ResponseCalculatorFormula
- Pycnometer Volume CorrectionCalculatorFormula
- Rate of Radioactive DecayCalculatorFormula
- Raymer-Hunt Transform - Porosity Transit Time RelationshipCalculatorFormula
- Relation Between Concentration of K Th or U and Recorded Total Gamma Ray SignalCalculatorFormula
- Relative Centrifugal ForceCalculatorFormula
- Reservoir Wettability Characterization Rise-in-Core MethodCalculatorFormula
- SDR NMR Permeability from T2 Geometric MeanCalculatorFormula
- Shale Index from Gamma Ray Spectrometry - PotassiumCalculatorFormula
- Shale Index from Gamma Ray Spectrometry - ThoriumCalculatorFormula
- Shale Index from Gamma Ray Spectrometry - Uranium-Free GammaCalculatorFormula
- Slowness of the FormationCalculatorFormula
- Sonic Compaction Correction Factor from Shale Transit TimeCalculatorFormula
- Sonic First-Arrival Time in a BoreholeCalculatorFormula
- Sonic Porosity Raymer-Hunt-Gardner MethodCalculatorFormula
- Spacing Between Transmitter and ReceiverCalculatorFormula
- Stieber Shale Volume from Gamma Ray IndexCalculatorFormula
- Total Porosity from Pore VolumesCalculatorFormula
- True Sonic Porosity from Compaction CorrectionCalculatorFormula
- USBM Wettability IndexCalculatorFormula
- Volumetric Photoelectric Absorption Cross SectionCalculatorFormula
- Wavelength EquationCalculatorFormula
- Wyllie Time-Average Sonic Porosity - Compacted FormationsCalculatorFormula
- Wyllie Time-Average Sonic Porosity - Uncompacted FormationsCalculatorFormula
Phase Behavior and Thermodynamics
102 calculators and formula references.
Fluid Properties
- Absolute Viscosity for Saybolt Viscosimeter MeasurementsCalculatorFormula
- Absolute Viscosity for Ubbelohde Viscosimeter MeasurementsCalculatorFormula
- Baker-Swerdloff Dead-Oil Gas-Oil Interfacial TensionCalculatorFormula
- Baker-Swerdloff Gas-Water Interfacial Tension at 280 FCalculatorFormula
- Baker-Swerdloff Gas-Water Interfacial Tension at 74 FCalculatorFormula
- Baker-Swerdloff Gas-Water Interfacial Tension by TemperatureCalculatorFormula
- Baker-Swerdloff Live-Oil Gas-Oil Interfacial TensionCalculatorFormula
- Beggs-Robinson Dead Oil Viscosity CorrelationCalculatorFormula
- Beggs-Robinson Live Oil Viscosity CorrelationCalculatorFormula
- Egbogah Dead Oil Viscosity Below Bubble PointCalculatorFormula
- Einstein Effective Viscosity for Dilute SuspensionsCalculatorFormula
- Formation Water Density at Reservoir ConditionsCalculatorFormula
- Formation Water Density at Standard ConditionsCalculatorFormula
- Formation Water Salinity from DensityCalculatorFormula
- Formation Water Specific Gravity from DensityCalculatorFormula
- Kinematic Viscosity for Saybolt Viscosimeter MeasurementsCalculatorFormula
- Kinematic Viscosity from Dynamic Viscosity and DensityCalculatorFormula
- Live Oil Density from Formation Volume FactorCalculatorFormula
- Logarithmic Crude Oil Viscosity from API GravityCalculatorFormula
- McCain Brine Gas-Solubility Salinity CorrectionCalculatorFormula
- McCain Brine Solution Gas-Water RatioCalculatorFormula
- McCain Pure-Water Solution Gas-Water RatioCalculatorFormula
- McCain Saturated Water Compressibility with Gas LiberationCalculatorFormula
- McCain Solution Gas-Water Pressure DerivativeCalculatorFormula
- McCain Water Viscosity at Atmospheric PressureCalculatorFormula
- McCain Water Viscosity at Reservoir PressureCalculatorFormula
- Newtonian Shear Stress from ViscosityCalculatorFormula
- Osif Water Isothermal CompressibilityCalculatorFormula
- Standard Discharge Time for Saybolt Viscosimeter MeasurementsCalculatorFormula
- Standing Dead Oil Viscosity CorrelationCalculatorFormula
- Standing Live Oil Density CorrelationCalculatorFormula
- Stock-Tank Oil Density from API GravityCalculatorFormula
- Vasquez-Beggs Oil Viscosity Above Bubble PointCalculatorFormula
- ViscosibilityCalculatorFormula
Gas Properties
- Beggs-Brill Gas Z-Factor CorrelationCalculatorFormula
- Corrected Sour Gas Pseudo-Reduced PropertiesCalculatorFormula
- Gas Hydrate Dissociation PressureCalculatorFormula
- Gas Molecular Weight from Specific GravityCalculatorFormula
- Generalized Virial Gas Z-Factor CorrelationCalculatorFormula
- Hydrate Formation Temperature from Modified Clapeyron CriterionCalculatorFormula
- Kay Mixing Rule Gas Pseudo-Critical PropertiesCalculatorFormula
- Lee-Gonzalez-Eakin Gas ViscosityCalculatorFormula
- Necessary Inhibitor Concentration Required in Liquid Phase to Reduce Hydrate PointCalculatorFormula
- Papay Gas Z-Factor CorrelationCalculatorFormula
- Pseudo-Reduced ConditionsCalculatorFormula
- Pseudo-Reduced Gas Properties from Critical PropertiesCalculatorFormula
- Real Gas DensityCalculatorFormula
- Real Gas Isothermal Compressibility with Z-Factor DerivativeCalculatorFormula
- Real Gas Pseudopressure DerivativeCalculatorFormula
- Real Gas Pseudopressure Difference for Constant Mu-ZCalculatorFormula
- Real Gas Pseudopressure Trapezoidal IncrementCalculatorFormula
- Specific Gravity of Gas Hydrate Forming ComponentsCalculatorFormula
- Standing Dry Gas Pseudo-Critical PropertiesCalculatorFormula
- Standing Wet Gas Pseudo-Critical PropertiesCalculatorFormula
- Sutton Pseudo-Critical Gas PropertiesCalculatorFormula
- Water Content of Sour GasCalculatorFormula
- Wichert-Aziz Sour Gas Pseudo-Critical CorrectionCalculatorFormula
PVT Properties
- Al-Marhoun Bubble Point PressureCalculatorFormula
- Al-Marhoun Saturated Oil Formation Volume FactorCalculatorFormula
- Al-Marhoun Solution Gas-Oil Ratio from Bubble Point PressureCalculatorFormula
- Average Compressibility of OilCalculatorFormula
- Average Gas SolubilityCalculatorFormula
- Beggs-Standing Oil Formation Volume Factor Above Bubble PointCalculatorFormula
- Beggs-Standing Oil Formation Volume Factor Below Bubble PointCalculatorFormula
- Benedict-Webb-Rubin PVT EquationCalculatorFormula
- Equilibrium Vaporization RatioCalculatorFormula
- Equilibrium Vaporization Ratio of HeptaneCalculatorFormula
- Glaso Bubble Point PressureCalculatorFormula
- Glaso Saturated Oil Formation Volume FactorCalculatorFormula
- Glaso Solution Gas-Oil Ratio from PressureCalculatorFormula
- Glaso Solution Gas-Oil Ratio from Saturated Oil FVFCalculatorFormula
- Glaso Undersaturated Oil Formation Volume FactorCalculatorFormula
- Jacoby Aromaticity FactorCalculatorFormula
- Latent Heat of Hydrocarbon MixtureCalculatorFormula
- Liquid-Phase Component Mole FractionCalculatorFormula
- McCain Water Formation Volume FactorCalculatorFormula
- Peng-Robinson Characterization FactorCalculatorFormula
- Peng-Robinson PVT EquationCalculatorFormula
- Petrosky-Farshad Bubble Point PressureCalculatorFormula
- Petrosky-Farshad Saturated Oil Formation Volume FactorCalculatorFormula
- Petrosky-Farshad Solution Gas-Oil Ratio from PressureCalculatorFormula
- Petrosky-Farshad Undersaturated Oil CompressibilityCalculatorFormula
- Petrosky-Farshad Undersaturated Oil Formation Volume FactorCalculatorFormula
- Redlich-Kwong PVT EquationCalculatorFormula
- Saturated Oil Compressibility from FVF and Solution GOR DerivativesCalculatorFormula
- Solution Gas-Oil Ratio - Beggs-Standing Correlation Below Bubble PointCalculatorFormula
- Solution Gas-Oil Ratio - Standing CorrelationCalculatorFormula
- Solution Gas-Water RatioCalculatorFormula
- Standing Oil Formation Volume FactorCalculatorFormula
- Van der Waals Attraction Parameter from Critical PropertiesCalculatorFormula
- Van der Waals Covolume from Critical PropertiesCalculatorFormula
- Van der Waals Critical Molar VolumeCalculatorFormula
- Van der Waals Critical Pressure from ParametersCalculatorFormula
- Van der Waals Critical Temperature from ParametersCalculatorFormula
- Van der Waals Equation of State PressureCalculatorFormula
- Vasquez-Beggs Bubble Point Pressure from Solution GORCalculatorFormula
- Vasquez-Beggs Saturated Oil Formation Volume FactorCalculatorFormula
- Vasquez-Beggs Solution Gas-Oil Ratio from PressureCalculatorFormula
- Vasquez-Beggs Undersaturated Oil CompressibilityCalculatorFormula
- Vasquez-Beggs Undersaturated Oil Formation Volume FactorCalculatorFormula
- Villena-Lanzi Saturated Oil CompressibilityCalculatorFormula
- Watson Characterization Factor from Boiling Point and Specific GravityCalculatorFormula
Production Engineering
198 calculators and formula references.
Hydraulic Fracturing
- Acid Dissolving Power for 15 Percent HCl - AcidizingCalculatorFormula
- Acid Penetration Distance - AcidizingCalculatorFormula
- Annulus Pressure Loss Due to Friction - Turbulent FlowCalculatorFormula
- Annulus Pressure Loss Due to Friction During Hydraulic Fracturing - Laminar FlowCalculatorFormula
- Average Fracture Width - AcidizingCalculatorFormula
- Average Permeability of Hydraulically Fractured FormationCalculatorFormula
- Average Specific Weight of Formation - Hydraulic FracturingCalculatorFormula
- Capacity Ratio of Hydraulically Fractured SurfaceCalculatorFormula
- Carter Leakoff Volume for Hydraulic FracturingCalculatorFormula
- Convective Mass Transfer for Laminar Flow (Acidizing)CalculatorFormula
- Downhole Operating Pressure - Hydraulic FracturingCalculatorFormula
- Dynamic-Test Fluid Loss per Unit Area - AcidizingCalculatorFormula
- Equivalent Skin Factor in Fractured WellsCalculatorFormula
- Filter-Cake Fluid-Loss Velocity - AcidizingCalculatorFormula
- Flow Through Fracture in Response to Pressure GradientCalculatorFormula
- Formation Fluid Compressibility - AcidizingCalculatorFormula
- Fracture Area from Saydam Leakoff FunctionCalculatorFormula
- Fracture Coefficient of Hydraulically Fractured ReservoirCalculatorFormula
- Fracture Conductivity from Proppant Permeability and WidthCalculatorFormula
- Fracture Fluid Coefficient - Reservoir-Controlled LiquidsCalculatorFormula
- Fracture Fluid Coefficient - Viscosity-Controlled LiquidsCalculatorFormula
- Fracture Fluid-Loss Reynolds Number - AcidizingCalculatorFormula
- Fracture Volume - GDK MethodCalculatorFormula
- Fracture Volume - Perkins and Kern MethodCalculatorFormula
- Fracture Width - GDK MethodCalculatorFormula
- Fracture Width - Perkins and Kern MethodCalculatorFormula
- Fracture-Fluid Invasion Velocity - AcidizingCalculatorFormula
- Frictional Pressure Drop - Economides and NolteCalculatorFormula
- Hydraulic Fracture Efficiency from Saydam Leakoff FunctionCalculatorFormula
- Hydraulic Horsepower for Hydraulic Fracturing OperationCalculatorFormula
- Ideal Fracture Conductivity Created by Acid ReactionCalculatorFormula
- Initial Rate Following a Hydraulic Fracturing OperationCalculatorFormula
- Injection Pressure for Hydraulic FracturingCalculatorFormula
- Mass of Rock Dissolved per Unit Mass of Acid - AcidizingCalculatorFormula
- Mass Transfer in Acid Solutions by Fick's Law - AcidizingCalculatorFormula
- Maximum Treatment Pressure - Hydraulic FracturingCalculatorFormula
- Net Fracture Pressure from Fracture and Closure PressureCalculatorFormula
- Peclet Number for Fluid Loss - AcidizingCalculatorFormula
- Pressure Loss Due to Perforations During Hydraulic FracturingCalculatorFormula
- Principal Stress Due to Petro-Static Pressure - Hydraulic FracturingCalculatorFormula
- Productivity Ratio from Average Permeability - Hydraulic FracturingCalculatorFormula
- Productivity Ratio of Hydraulically Fractured FormationCalculatorFormula
- Proppant Settlement Drag Coefficient in FractureCalculatorFormula
- Reynolds Number for Acid Flow into the Fracture - AcidizingCalculatorFormula
- Sand Weight to Refill Hydraulically Fractured Reservoir VolumeCalculatorFormula
- Static-Test Fluid Loss per Unit Area - AcidizingCalculatorFormula
- Treatment Fracture Gradient - Hydraulic FracturingCalculatorFormula
- Turbulent Acidizing Mass Transfer Flux - Coefficient FormCalculatorFormula
- Turbulent Acidizing Mass Transfer Flux - Effective Diffusivity FormCalculatorFormula
- Wellbore Fracture Width - AcidizingCalculatorFormula
- Wellbore Pressure Loss Due to Friction - Turbulent FlowCalculatorFormula
- Wormhole Fluid-Loss Reynolds Number - AcidizingCalculatorFormula
- Young Modulus from Sonic Travel Time (Acidizing)CalculatorFormula
Inflow Performance
- Composite IPR Productivity IndexCalculatorFormula
- Damaged to Undamaged Productivity Ratio - AcidizingCalculatorFormula
- Fetkovich Oil Deliverability RateCalculatorFormula
- Flow Coefficient During DrawdownCalculatorFormula
- Gas Deliverability Pressure-Squared DrawdownCalculatorFormula
- Horizontal Well Fetkovich IPR RateCalculatorFormula
- Jones-Blount-Glaze Gas Deliverability RateCalculatorFormula
- PI Test Skin Factor and Average PermeabilityCalculatorFormula
- Productivity Index and Straight-Line IPRCalculatorFormula
- Productivity Index for a Gas WellCalculatorFormula
- Rawlins-Schellhardt Absolute Open Flow PotentialCalculatorFormula
- Rawlins-Schellhardt Deliverability Coefficient from Test PointCalculatorFormula
- Rawlins-Schellhardt Deliverability Exponent from Two Test PointsCalculatorFormula
- Rawlins-Schellhardt Gas Deliverability RateCalculatorFormula
- Straight-Line IPR Rate from Test PointCalculatorFormula
- Vogel Inflow Performance RelationshipCalculatorFormula
- Vogel IPR Rate from One Test PointCalculatorFormula
Injection Wells
- Cumulative Hall Plot Pressure IntegralCalculatorFormula
- Cumulative Water Injected for Hall PlotCalculatorFormula
- Hall Injectivity Change Ratio from SlopesCalculatorFormula
- Hall Injectivity Coefficient from SlopeCalculatorFormula
- Hall Plot Pressure-Time IncrementCalculatorFormula
- Hall Plot Slope from Two Surveillance PointsCalculatorFormula
- Injected Hydrocarbon Pore VolumesCalculatorFormula
- Injectivity IndexCalculatorFormula
- Radial Water Injection RateCalculatorFormula
- Radial Water Injectivity IndexCalculatorFormula
- Voidage Replacement RatioCalculatorFormula
- Water Injection Bottom-Hole Pressure from Radial FlowCalculatorFormula
- Waterflood Mobility RatioCalculatorFormula
Well Performance
- Additional Pressure Drop in the Skin ZoneCalculatorFormula
- Adsorption Unit Bed Length from Mass Transfer ZoneCalculatorFormula
- Adsorption Unit Mass Transfer Zone LengthCalculatorFormula
- API RP 14E Actual Mixture VelocityCalculatorFormula
- API RP 14E Erosional VelocityCalculatorFormula
- API RP 14E Erosional Velocity UtilizationCalculatorFormula
- API RP 14E Gas-Liquid Mixture DensityCalculatorFormula
- API RP 14E Minimum Flow Area per 1000 Barrels LiquidCalculatorFormula
- API RP 14E Minimum Velocity RatioCalculatorFormula
- API RP 14E Required Pipe Inside DiameterCalculatorFormula
- API RP 14E Total Wellstream Weight Flow RateCalculatorFormula
- API RP 14E Two-Phase Flowline Pressure DropCalculatorFormula
- Approximate Ideal Counterbalanced LoadCalculatorFormula
- ASME Separator Pressure Criterion - External RadiusCalculatorFormula
- ASME Separator Pressure Criterion - Internal RadiusCalculatorFormula
- ASME Separator Wall Thickness from External RadiusCalculatorFormula
- ASME Separator Wall Thickness from Internal RadiusCalculatorFormula
- ASME Spherical Separator Shell ThicknessCalculatorFormula
- Average Downstroke Load - Sucker Rod PumpCalculatorFormula
- Average Liquid Specific Gravity for Mixed Liquid StreamCalculatorFormula
- Average Upstroke Load - Sucker Rod PumpCalculatorFormula
- CaCl2 and CaBr2 Salt Addition for Two-Salt BrineCalculatorFormula
- Choke Discharge CoefficientCalculatorFormula
- Choke Outlet TemperatureCalculatorFormula
- Close-Ended Displacement Volume of PipeCalculatorFormula
- Correct Counterbalance - Sucker Rod PumpCalculatorFormula
- Darcy-Weisbach Tubing Friction Pressure DropCalculatorFormula
- Density of Brine (Completion and Workover Fluids)CalculatorFormula
- Effective Wellbore Radius from Skin FactorCalculatorFormula
- Entrance Hole Size from Casing Yield StrengthCalculatorFormula
- ESP BEP Operating RatioCalculatorFormula
- ESP Brake Horsepower from TDH and EfficiencyCalculatorFormula
- ESP Brake Horsepower Speed CorrectionCalculatorFormula
- ESP Flow Rate Speed CorrectionCalculatorFormula
- ESP Head Speed CorrectionCalculatorFormula
- ESP Net Lift from Pump Intake PressureCalculatorFormula
- ESP Stages Required with Safety MarginCalculatorFormula
- ESP Total Brake Horsepower from Stage CurveCalculatorFormula
- ESP Total Dynamic Head from ComponentsCalculatorFormula
- ESP Total Pump Head from StagesCalculatorFormula
- ESP Wellhead Pressure HeadCalculatorFormula
- Flow Efficiency with Skin Pressure DropCalculatorFormula
- Foamless Separator Length-Diameter Correction FactorCalculatorFormula
- Fuel Gas Wobbe IndexCalculatorFormula
- Gas Conditioning Relative HumidityCalculatorFormula
- Gas Conditioning Stripping FactorCalculatorFormula
- Gas Mass Velocity in an Adsorption UnitCalculatorFormula
- Gas Mass Velocity in SeparatorCalculatorFormula
- Gas Pressure Testing Time for Unsteady Gas FlowCalculatorFormula
- Gas Separator Internal Diameter from Mass FlowCalculatorFormula
- Gas-Lift Valve Opening Casing PressureCalculatorFormula
- Gas-Liquid Ratio from Gas and Liquid RatesCalculatorFormula
- Gilbert Critical Choke Liquid RateCalculatorFormula
- Glycol Dehydration Still Column DiameterCalculatorFormula
- Horizontal Separator Length for Liquid RetentionCalculatorFormula
- Horizontal Separator Liquid Volume from GeometryCalculatorFormula
- Horizontal Separator Maximum Vapor Velocity from Droplet SettlingCalculatorFormula
- Incremental Density in Wellbore Interval - Completion and Workover FluidsCalculatorFormula
- Intermediate Law Droplet Settling VelocityCalculatorFormula
- Liquid-Liquid Vessel Retention TimeCalculatorFormula
- Minimum Polished Rod Load - Sucker Rod PumpCalculatorFormula
- Multiphase Wellhead Pressure Across ChokeCalculatorFormula
- Newton Law Droplet Settling VelocityCalculatorFormula
- Oil-Well Perforation Pressure DropCalculatorFormula
- Packed Column Actual HeightCalculatorFormula
- Peak Polished Rod Load - Sucker Rod PumpCalculatorFormula
- Perforation Friction PressureCalculatorFormula
- Perforation Hole Size from Brinell HardnessCalculatorFormula
- Perforation Length in FormationCalculatorFormula
- Perforation Skin FactorCalculatorFormula
- Pipe Volume CapacityCalculatorFormula
- Polished Rod Horsepower - Sucker Rod PumpCalculatorFormula
- Pressure Drop Across Perforations in Gas WellsCalculatorFormula
- Productivity RatioCalculatorFormula
- Progressive Cavity Pump Flow RateCalculatorFormula
- Progressive Cavity Pump Head RatingCalculatorFormula
- Progressive Cavity Pump Mechanical Resistant TorqueCalculatorFormula
- Pseudo-Skin Factor Due to Partial Penetration - Papatzacos CorrelationCalculatorFormula
- Range of Load - Sucker Rod PumpCalculatorFormula
- Raoult's Law Water Fraction in Glycol DehydrationCalculatorFormula
- Recommended Underbalanced Perforation PressureCalculatorFormula
- Refrigeration Outlet Temperature for Gas ConditioningCalculatorFormula
- Required Oil Section Length in SeparatorCalculatorFormula
- Required Water Section Length in SeparatorCalculatorFormula
- Safety Relief Valve Vapor Flow CapacityCalculatorFormula
- Separator Actual Gas VelocityCalculatorFormula
- Separator Droplet Reynolds NumberCalculatorFormula
- Separator Gas Capacity at Standard ConditionsCalculatorFormula
- Separator Gas Capacity from DiameterCalculatorFormula
- Separator Gas Capacity UtilizationCalculatorFormula
- Separator Liquid Retention UtilizationCalculatorFormula
- Separator Minimum Diameter from Gas CapacityCalculatorFormula
- Separator Required Liquid Retention VolumeCalculatorFormula
- Shape Factor Expressed as Skin Factor for Vertical WellsCalculatorFormula
- Single-Phase Gas Flow SubsonicCalculatorFormula
- Single-Phase Liquid Flow Through ChokeCalculatorFormula
- Single-Salt Brine Density Increase Salt Addition Method IICalculatorFormula
- Skin Factor Due to Reduced Crushed-Zone PermeabilityCalculatorFormula
- Skin Factor for a Deviated WellCalculatorFormula
- Skin Factor from Damaged Zone PermeabilityCalculatorFormula
- Souders-Brown Maximum Gas Velocity for SeparatorCalculatorFormula
- Stokes Law Droplet Settling VelocityCalculatorFormula
- Stokes Region Maximum Droplet DiameterCalculatorFormula
- Suspension Property of Static Fluids (Completion and Workover Fluids)CalculatorFormula
- TEG Weight Percent in Glycol Dehydration UnitCalculatorFormula
- Three-Phase Separator Liquid Retention VolumeCalculatorFormula
- Total Skin in Partially Depleted Wells for a Buildup TestCalculatorFormula
- Tubing Bottomhole Pressure from Wellhead Pressure and LossesCalculatorFormula
- Turner Critical Gas Rate for Liquid LoadingCalculatorFormula
- Velocity of Fluid in PipeCalculatorFormula
- Water Volume to Dilute Brine in Two-Salt SystemsCalculatorFormula
- Well Flowing Pressure Line-Source Solution by Including Skin FactorCalculatorFormula
- Wellbore Storage Due to Fluid LevelCalculatorFormula
- Wellstream Volumetric Flow Rate from Weight FlowCalculatorFormula
- Workover Operations Maximum Allowed Tubing PressureCalculatorFormula
Reservoir Engineering
303 calculators and formula references.
Fluid Flow in Porous Media
- Darcy's Law for Linear Single-Phase FlowCalculatorFormula
- Drainage Radius from AreaCalculatorFormula
- Hydraulic Diffusivity Coefficient in Field UnitsCalculatorFormula
- Interstitial Velocity from Flow Rate Area and PorosityCalculatorFormula
- Linear Darcy Flow ConductanceCalculatorFormula
- Low-Pressure Gas Radial Flow RateCalculatorFormula
- Pseudosteady-State Radial Oil Flow RateCalculatorFormula
- Pseudosteady-State Radial Productivity IndexCalculatorFormula
- Radial Pressure Distribution in Single-Phase Liquid FlowCalculatorFormula
- Single Phase Mobility from Permeability and ViscosityCalculatorFormula
- Steady-State Radial Liquid Flow RateCalculatorFormula
- Steady-State Radial Liquid Productivity IndexCalculatorFormula
- Superficial Velocity from Flow Rate and AreaCalculatorFormula
Material Balance
- Cumulative Gas Production from Gas ExpansionCalculatorFormula
- Gas Drive Index in Gas ReservoirsCalculatorFormula
- Gas Expansion Factor from Cumulative Gas ProductionCalculatorFormula
- Gas Expansion Term in Gas ReservoirsCalculatorFormula
- Gas Material Balance EquationCalculatorFormula
- Gas Recovery Factor from p/z Material BalanceCalculatorFormula
- Gas Saturation in Water-Drive Gas ReservoirsCalculatorFormula
- Havlena-Odeh Cumulative Water Influx from Fluid WithdrawalCalculatorFormula
- Initial Gas CapCalculatorFormula
- Initial Gas In Place for Water-Drive Gas ReservoirCalculatorFormula
- Modified Cole Plot for Water-Drive Gas ReservoirsCalculatorFormula
- Original Gas in Place from p/z Material BalanceCalculatorFormula
- Rock Expansion Term in Abnormally Pressured Gas ReservoirsCalculatorFormula
- Schilthuis Cumulative Water InfluxCalculatorFormula
- Trapped Gas Volume in Water-Invaded ZonesCalculatorFormula
- Underground Fluid Withdrawal - Havlena and OdehCalculatorFormula
- van Everdingen-Hurst Single-Step Water InfluxCalculatorFormula
- Water Influx Constant for van Everdingen-Hurst AquiferCalculatorFormula
- Water Influx from Pot Aquifer ModelCalculatorFormula
- Water-Drive Index for Gas ReservoirsCalculatorFormula
Material Balance and Production
- Connate Water and Rock Expansion TermCalculatorFormula
- Cumulative Gas Production – Tarner’s MethodCalculatorFormula
- Cumulative Oil Production in Undersaturated Oil ReservoirsCalculatorFormula
- Gas Cap RatioCalculatorFormula
- Gas Cap Shrinkage from Gas Cap ProductionCalculatorFormula
- Gas Produced by Gas ExpansionCalculatorFormula
- Hammerlindl Method for Gas in PlaceCalculatorFormula
- Hydrocarbon Pore Volume Occupied by Evolved Solution GasCalculatorFormula
- Hydrocarbon Pore Volume Occupied by Gas CapCalculatorFormula
- Hydrocarbon Pore Volume Occupied by Remaining OilCalculatorFormula
- Oil and Dissolved Gas Expansion TermCalculatorFormula
- Oil Bubble Radius for Circular Drainage AreaCalculatorFormula
- Oil in Place for Undersaturated Oil Reservoirs without Fluid InjectionCalculatorFormula
- Oil in Place in Saturated Oil ReservoirsCalculatorFormula
- Oil Material Balance Drive Index ClosureCalculatorFormula
- Oil Reservoir Underground WithdrawalCalculatorFormula
- Original Oil in Place from General Oil Material BalanceCalculatorFormula
- Pore Volume Occupied by Injected Gas and WaterCalculatorFormula
- Produced Gas-Oil RatioCalculatorFormula
- Total Oil Reservoir Expansion TermCalculatorFormula
Permeability
- Average Permeability for Linear Flow - Series BedsCalculatorFormula
- Average Permeability for Linear Flow in Layered BedsCalculatorFormula
- Average Permeability for Parallel-Layered SystemsCalculatorFormula
- Average Permeability in Radial SystemsCalculatorFormula
- Binary Power-Average Effective PermeabilityCalculatorFormula
- Gas Permeability from Core Plug Pressure-Squared FlowCalculatorFormula
- Geometric Mean Permeability from Log AverageCalculatorFormula
- Jones-Owens Klinkenberg Slip FactorCalculatorFormula
- Klinkenberg Apparent Gas PermeabilityCalculatorFormula
- Kozeny Permeability from Porosity and Specific Surface AreaCalculatorFormula
- Kozeny-Carman Permeability from Grain DiameterCalculatorFormula
- Lognormal Effective Permeability from Geometric MeanCalculatorFormula
- Modified Kozeny-Carman Permeability with Percolation PorosityCalculatorFormula
Permeability and Flow
- Buckley-Leverett Breakthrough Pore VolumesCalculatorFormula
- Buckley-Leverett Saturation Front VelocityCalculatorFormula
- Calculation of Fractional Flow CurveCalculatorFormula
- Corey Oil Relative PermeabilityCalculatorFormula
- Corey Water Relative PermeabilityCalculatorFormula
- Crossflow IndexCalculatorFormula
- Normalized SaturationCalculatorFormula
- Normalized Water Saturation for Relative PermeabilityCalculatorFormula
- Pseudosteady-State Radial Liquid Flow RateCalculatorFormula
- Relative Permeability from Effective PermeabilityCalculatorFormula
- Torcaso-Wyllie Relative Permeability Ratio PredictionCalculatorFormula
Pressure Transient Analysis
- Carter Dimensionless Drawdown Correlating ParameterCalculatorFormula
- Cole PlotCalculatorFormula
- Dimensionless Buildup Pressure for Liquid FlowCalculatorFormula
- Dimensionless Buildup Pressure from Semilog SlopeCalculatorFormula
- Dimensionless Buildup TimeCalculatorFormula
- Dimensionless Cumulative Production for Radial Flow Constant-Pressure ProductionCalculatorFormula
- Dimensionless Length for Fracture Linear FlowCalculatorFormula
- Dimensionless Length for Linear Flow General CaseCalculatorFormula
- Dimensionless Pressure - Radial Flow Constant-Pressure ProductionCalculatorFormula
- Dimensionless Pressure - Radial Flow Constant-Rate ProductionCalculatorFormula
- Dimensionless Pressure – Kamal and BrighamCalculatorFormula
- Dimensionless Pressure for Linear Flow Constant Rate General CaseCalculatorFormula
- Dimensionless Production TimeCalculatorFormula
- Dimensionless Radius of Radial Flow – Constant-Rate ProductionCalculatorFormula
- Dimensionless Rate for Radial Flow Constant-Pressure ProductionCalculatorFormula
- Dimensionless Shut-In Time for MDH MethodCalculatorFormula
- Dimensionless Storage Constant for Gas Buildup TestsCalculatorFormula
- Dimensionless Storage Constant for Liquid Buildup TestsCalculatorFormula
- Dimensionless Time for Fracture Linear FlowCalculatorFormula
- Dimensionless Time for Interference Testing in Homogeneous Reservoirs – EarlougherCalculatorFormula
- Dimensionless Time for Linear Flow Constant Rate General CaseCalculatorFormula
- Dimensionless Time for Radial Flow Constant-Rate ProductionCalculatorFormula
- Dimensionless Vertical Well Critical Rate Correlations – Hoyland, Papatzacos, and SkjaevelandCalculatorFormula
- Dimensionless Wellbore Storage Coefficient of Radial Flow – Constant-Rate ProductionCalculatorFormula
- Drawdown Semilog Slope for Bottomhole Flowing PressureCalculatorFormula
- Estimation of Average Reservoir Pressure – MDH MethodCalculatorFormula
- Flow Period Duration for Hydraulically Fractured WellsCalculatorFormula
- Fracture Conductivity During Bilinear FlowCalculatorFormula
- Horner Pressure Buildup EquationCalculatorFormula
- Horner Semilog Buildup Pressure ExtrapolationCalculatorFormula
- Horner Time Ratio for Pressure Buildup TestCalculatorFormula
- Infinite-Acting Pseudoradial Bottomhole Flowing PressureCalculatorFormula
- Line-Source Pressure Beyond the WellboreCalculatorFormula
- Minimum Shut-In Time to Pseudosteady State for Hydraulically Fractured Tight Gas ReservoirsCalculatorFormula
- Permeability from Pressure Transient Semilog SlopeCalculatorFormula
- Pseudosteady-State Dimensionless Pressure Drop for Fractured Vertical WellCalculatorFormula
- Pseudosteady-State Dimensionless Pressure Drop for Horizontal WellCalculatorFormula
- Pseudosteady-State Flowing Pressure for Non-Circular ReservoirCalculatorFormula
- Pseudosteady-State Slope in Pressure Buildup TestCalculatorFormula
- Radius of InvestigationCalculatorFormula
- Radius of Investigation from Flow TimeCalculatorFormula
- Radius of Investigation from Shut-In TimeCalculatorFormula
- Shut-In Time for Pressure Build-Up Test - Dietz MethodCalculatorFormula
- Skin During Infinite-Acting Pseudoradial FlowCalculatorFormula
- Skin Factor from Pressure Transient Semilog AnalysisCalculatorFormula
- Time to End of Infinite-Acting Period in Circular ReservoirCalculatorFormula
- Time to Pseudosteady State in Circular ReservoirCalculatorFormula
- Time to Semi-Steady State for Gas Well Drainage AreaCalculatorFormula
- True Wellbore Storage Coefficient for Pressure Buildup TestCalculatorFormula
- Wellbore Storage Coefficient from Fluid Volume ChangeCalculatorFormula
PVT and Rock-Fluid Properties
- API GravityCalculatorFormula
- Capillary NumberCalculatorFormula
- Capillary PressureCalculatorFormula
- Characteristic Time for Linear Diffusion in ReservoirsCalculatorFormula
- Compressibility Drive in Gas ReservoirsCalculatorFormula
- Cumulative Effective Compressibility – FetkovichCalculatorFormula
- Cumulative Oil Production – Undersaturated Oil ReservoirsCalculatorFormula
- Effective Compressibility in Undersaturated Oil Reservoirs – HawkinsCalculatorFormula
- Fraction of the Total Solution Gas Retained in the Reservoir as Free GasCalculatorFormula
- Free Gas in PlaceCalculatorFormula
- Oil Saturation Below Bubble Point During DepletionCalculatorFormula
- Total Compressibility from Phase SaturationsCalculatorFormula
PVT Properties
- Gas Expansion Factor from Formation Volume FactorCalculatorFormula
- Gas Formation Volume FactorCalculatorFormula
- Instantaneous Gas-Oil RatioCalculatorFormula
- Two-Phase Formation Volume FactorCalculatorFormula
- Water Two-Phase Formation Volume FactorCalculatorFormula
Reserves and Recovery
- Arps Exponential Decline Cumulative ProductionCalculatorFormula
- Arps Exponential Decline RateCalculatorFormula
- Arps Harmonic Decline Cumulative ProductionCalculatorFormula
- Arps Harmonic Decline RateCalculatorFormula
- Arps Hyperbolic Decline Cumulative ProductionCalculatorFormula
- Arps Hyperbolic Decline RateCalculatorFormula
- Condensate Production Rate from Gas Rate and YieldCalculatorFormula
- Exponential Decline Time to Economic LimitCalculatorFormula
- Gas-Condensate Liquid Content from Producing GORCalculatorFormula
- NGL Production Rate from Gas Rate and YieldCalculatorFormula
- Oil Lost During Gas-Cap MigrationCalculatorFormula
- Oil Recovery Factor from Cumulative ProductionCalculatorFormula
- Recoverable Condensate from Cumulative Gas and YieldCalculatorFormula
Reservoir Volumetrics
- Gross Rock Volume from Area and Gross ThicknessCalculatorFormula
- Gross Rock Volume in Acre-Feet from Area and ThicknessCalculatorFormula
- Gross Rock Volume in Reservoir BarrelsCalculatorFormula
- Hydrocarbon Pore Volume - Volumetric MethodCalculatorFormula
- Hydrocarbon Pore Volume from Pore Volume and Water SaturationCalculatorFormula
- Net Pay Thickness from Gross Thickness and Net-to-GrossCalculatorFormula
- Net Reservoir Rock Volume from Net-to-GrossCalculatorFormula
- Net Rock Volume in Reservoir Barrels from Net-to-GrossCalculatorFormula
- Original Condensate In Place from Gas In Place and Liquid ContentCalculatorFormula
- Original Condensate In Place with Net-to-GrossCalculatorFormula
- Original Gas in Place - Volumetric MethodCalculatorFormula
- Original Gas In Place with Net-to-GrossCalculatorFormula
- Original Oil in Place - Volumetric MethodCalculatorFormula
- Original Water In Place with Net-to-GrossCalculatorFormula
- Pore Volume from Net Rock Volume and PorosityCalculatorFormula
- Reservoir Gas Volume from Gas In Place and Gas FVFCalculatorFormula
- Reservoir Oil Volume from Stock Tank Oil and Oil FVFCalculatorFormula
- Reservoir Pore Volume - Volumetric MethodCalculatorFormula
- Stock Tank Oil Initially In Place with Net-to-GrossCalculatorFormula
Rock Properties
- Core Bulk Volume from Saturated and Immersed WeightsCalculatorFormula
- Core Pore Volume from Saturated and Dry WeightsCalculatorFormula
- Effective Porosity from Connected Pore VolumeCalculatorFormula
- Exponential Pore Volume from Rock CompressibilityCalculatorFormula
- Exponential Porosity from Rock CompressibilityCalculatorFormula
- Ineffective Porosity from Disconnected Pore VolumeCalculatorFormula
- Leijnse Porosity from Rock CompressibilityCalculatorFormula
- Leverett J-Function from Capillary PressureCalculatorFormula
- Maximum Oil Column Height in Cap RockCalculatorFormula
- Pore Throat Sorting from Capillary Pressure QuartilesCalculatorFormula
- Quadratic Porosity Multiplier from Rock CompressibilityCalculatorFormula
- Total Pore Volume CompressibilityCalculatorFormula
- Total Porosity from Bulk and Grain VolumeCalculatorFormula
- Total Porosity from Pore and Bulk VolumeCalculatorFormula
- Total Porosity from Pore and Grain VolumeCalculatorFormula
Thermal Gradients
- Average Temperature of a Gas ColumnCalculatorFormula
- Conductive Heat Flow from Geothermal GradientCalculatorFormula
- Formation Temperature for a Given GradientCalculatorFormula
- Geothermal Gradient from Temperature Log IntervalCalculatorFormula
- Horner Formation Temperature from Bottom-Hole TemperatureCalculatorFormula
- Horner Time Ratio for Bottom-Hole Temperature CorrectionCalculatorFormula
- Reservoir Heat Required for Temperature IncreaseCalculatorFormula
- Thermal Conductivity from Heat FlowCalculatorFormula
- Thermal DiffusivityCalculatorFormula
- Volumetric Heat Capacity of a ReservoirCalculatorFormula
- Waples-Ramly Single-Point Bottom-Hole Temperature CorrectionCalculatorFormula
Unconventional Reservoirs
- Adsorbed Gas in Place from Langmuir IsothermCalculatorFormula
- Adsorbed Gas Recovery Factor from Langmuir PressuresCalculatorFormula
- Apparent Sorption CompressibilityCalculatorFormula
- Coal Mass from Area Thickness and Bulk DensityCalculatorFormula
- Coalbed Methane Formation CompressibilityCalculatorFormula
- Communication Factor in a Compartment in Tight Gas ReservoirsCalculatorFormula
- Correction Factor – HammerlindlCalculatorFormula
- Dimensionless Time for Semi-Steady-State Coalbed Methane FlowCalculatorFormula
- Fractional Gas Recovery Below the Critical Desorption Pressure in Coal Bed Methane ReservoirsCalculatorFormula
- Gas Adsorbed in Coalbed Methane ReservoirsCalculatorFormula
- Gas Solubility in Coalbed Methane ReservoirsCalculatorFormula
- Hagoort and Hoogstra Tight Gas Compartment FlowCalculatorFormula
- Langmuir Adsorbed Gas ContentCalculatorFormula
- Langmuir Desorbable Gas Content Between PressuresCalculatorFormula
- Payne Intercompartmental Gas Flow in Tight Gas ReservoirsCalculatorFormula
- Remaining Gas in Place in Coalbed Methane ReservoirsCalculatorFormula
- Somerton Formation Permeability in Coalbed Methane ReservoirsCalculatorFormula
- Tight Gas Pore Volume from Squared-Pressure DeclineCalculatorFormula
- Tight-Gas Compartment Underground WithdrawalCalculatorFormula
- Transmissibility Between Tight Gas CompartmentsCalculatorFormula
- Transmissibility of a Tight Gas CompartmentCalculatorFormula
- Volume of Gas Adsorbed in Coalbed Methane ReservoirsCalculatorFormula
Waterflooding and EOR
- Areal Extent of Heated Zone in Thermal RecoveryCalculatorFormula
- Average Reservoir Temperature in Cyclic Steam InjectionCalculatorFormula
- Burned Reservoir Volume from Air RequirementCalculatorFormula
- Chromatographic Lag in Polymer FloodingCalculatorFormula
- Combustion Front Advancement RateCalculatorFormula
- Cumulative Heat Injected for Steam Drive - Myhill and StegemeierCalculatorFormula
- Cumulative Oil Displacement from Water Saturation ChangeCalculatorFormula
- Dimensionless Air Injection Rate for In-Situ CombustionCalculatorFormula
- Dimensionless Heat Injection Rate - Gringarten and SautyCalculatorFormula
- Dimensionless Steam Heat-Capacity RatioCalculatorFormula
- Dimensionless Time in Wet Combustion - KuoCalculatorFormula
- Dykstra-Parsons CoefficientCalculatorFormula
- Effective Apparent TransmissivityCalculatorFormula
- Effective Oil Transmissivity for Thermal StimulationCalculatorFormula
- Equivalent Atomic H/C Ratio for In-Situ Combustion FuelCalculatorFormula
- Equivalent Steam Volume Injected - Myhill and StegemeierCalculatorFormula
- Equivalent Water Saturation in Burned Zone - NelsonCalculatorFormula
- Fraction of Injected Heat Remaining in ReservoirCalculatorFormula
- Heat Released During In-Situ Combustion - Burger and SahuquetCalculatorFormula
- Heat Remaining in Reservoir - Marx and LangenheimCalculatorFormula
- Heated-Zone Oil Recovery from Air-Oil RatioCalculatorFormula
- Hot-Water Flood Fractional Flow from Mobility RatioCalculatorFormula
- Hot-Water Flood Layer Saturation from TemperatureCalculatorFormula
- Hot-Water Flood Real Time from Dimensionless TimeCalculatorFormula
- Hot-Water Heated-Zone Area Growth RateCalculatorFormula
- Ignition Delay Time in In-Situ CombustionCalculatorFormula
- In-Situ Combustion Oil Production - Nelson and McNeilCalculatorFormula
- In-Situ Combustion Temperature Increase RateCalculatorFormula
- In-Situ Combustion Water Production - Nelson and McNeilCalculatorFormula
- Latent Heat Fraction in Steam Drive InjectionCalculatorFormula
- Minimum Air Flux for Fire-Front Advance - Nelson and McNielCalculatorFormula
- Myhill-Stegemeier Thermal Dimensionless TimeCalculatorFormula
- Oil Breakthrough Newly Swept ZoneCalculatorFormula
- Oil Solubilization FactorCalculatorFormula
- Oil Volume at Breakthrough - Craig, Geffen, and MorseCalculatorFormula
- Oxygen Reaction Rate per Unit Fuel MassCalculatorFormula
- Reservoir Fuel Burned per Bulk Volume - Nelson and McNielCalculatorFormula
- Slug Size in Polymer FloodsCalculatorFormula
- Steady-State Five-Spot Steam-Drive Injection RateCalculatorFormula
- Steam Drive Cumulative Oil Produced - PratsCalculatorFormula
- Steam Drive Heat Injection Rate from Boiler Feed WaterCalculatorFormula
- Steam Zone Reservoir Volume from Injected HeatCalculatorFormula
- Steam-Heated Area Growth - Marx and LangenheimCalculatorFormula
- Steam-Oil Ratio - Marx and LangenheimCalculatorFormula
- Steam-Zone Growth Increment from Heat CapacityCalculatorFormula
- Water Cut - StilesCalculatorFormula
- Water-Drive Recovery Efficiency - Craig CorrelationCalculatorFormula
- Waterflood Oil Displacement Ratio from Average SaturationCalculatorFormula
- Welge Extension Fractional Flow Relative Permeability RatioCalculatorFormula
- Wet In-Situ Combustion Oil Production - Nelson and McNeilCalculatorFormula
Well Performance
- Bournazel Jeanson Vertical Well Water Breakthrough Dimensionless TimeCalculatorFormula
- Craft and Hawkins Vertical Well Critical Coning RateCalculatorFormula
- Critical Rate for Horizontal Wells in Edge-Water Drive ReservoirsCalculatorFormula
- Deliverability Equation for Shallow Gas ReservoirsCalculatorFormula
- Dimensionless Fracture ConductivityCalculatorFormula
- Effective Wellbore Radius of a Horizontal Well – Method 1 (Anisotropic Reservoirs)CalculatorFormula
- Effective Wellbore Radius of a Horizontal Well – van der Vlis et al. MethodCalculatorFormula
- Effective Wellbore Radius of a Well in Presence of Uniform Flux FracturesCalculatorFormula
- Efros Horizontal Well Critical RateCalculatorFormula
- Finite-Conductivity Fracture Effective Wellbore RadiusCalculatorFormula
- Gas Flow Rate into the WellboreCalculatorFormula
- Generalized Reservoir Gas Flow DeliverabilityCalculatorFormula
- Giger-Karcher Horizontal Well Critical RateCalculatorFormula
- High-Pressure Region Gas Flow RateCalculatorFormula
- Horizontal Well Breakthrough Dimensionless Flow RateCalculatorFormula
- Horizontal Well Breakthrough Dimensionless TimeCalculatorFormula
- Hoyland Papatzacos Skjaeveland Isotropic Vertical Well Critical RateCalculatorFormula
- Joshi Horizontal Well Critical Rate for Gas ConingCalculatorFormula
- Joshi Horizontal Well Drainage Ellipse AreaCalculatorFormula
- Joshi Horizontal Well Productivity IndexCalculatorFormula
- Joshi Isotropic Horizontal Well Effective RadiusCalculatorFormula
- Laminar Gas Flow Rate from Real-Gas PseudopressureCalculatorFormula
- Low-Pressure Non-Circular Gas Flow RateCalculatorFormula
- Meyer Gardner Pirson Vertical Gas-Coning Critical RateCalculatorFormula
- Meyer Gardner Pirson Vertical Well Critical Coning RateCalculatorFormula
- Prats High-Conductivity Fracture Effective Wellbore RadiusCalculatorFormula
- Pseudo-Steady State Horizontal Well Productivity Method 3CalculatorFormula
- Sobocinski Cornelius Vertical Well Breakthrough Dimensionless TimeCalculatorFormula
- Sobocinski Cornelius Vertical Well Cone Height RatioCalculatorFormula