Oil & Gas Technical Library
Topic articles with variable definitions, context, interpretation, and usage notes. Engineering workflow suites — Reservoir, Drilling, Production, Flow Assurance, and 7 more, under engagement each.
Reservoir Engineering
Arps Decline Curve Analysis
Learn the Arps exponential, hyperbolic, and harmonic decline models for forecasting oil & gas production and EUR.
ReadBubble Point Pressure
Estimate bubble point pressure using Standing's correlation from GOR, gas gravity, API, and temperature.
ReadBuckley-Leverett Fractional Flow
Calculate water saturation profile, breakthrough time, and recovery factor during waterflooding.
ReadCapillary Pressure Leverett J-Function
Calculate capillary pressure and normalize Pc data using the Leverett J-function.
ReadGas Compressibility Z-Factor
Calculate gas density, FVF, and isothermal compressibility from Z-factor and gas properties.
ReadMaterial Balance Havlena-Odeh
Estimate OOIP using the Havlena-Odeh straight-line method and general material balance equation.
ReadPVT Correlations
Estimate bubble point, oil FVF, viscosity, and GOR using Standing and Beggs-Robinson correlations.
ReadRecovery Factor
Estimate oil recovery factor using volumetric OOIP, API correlations, and drive mechanism analysis.
ReadStanding-Katz Z-Factor Chart
Calculate gas Z-factor using Hall-Yarborough and Dranchuk-Abou-Kassem methods.
ReadDrilling Engineering
Bit Hydraulics
Calculate bit pressure drop, nozzle velocity, hydraulic horsepower, and impact force for drilling optimization.
ReadCasing Burst & Collapse
Calculate casing burst and collapse ratings using Barlow's formula and API 5C3 standards.
ReadCement Volume Calculator
Calculate annular volume, cement sacks, mix water, and displacement for cementing operations.
ReadDogleg Severity Calculator
Calculate dogleg severity using the minimum curvature method for directional wells.
ReadECD Calculator
Calculate equivalent circulating density from mud weight and annular pressure losses.
ReadFormation Pressure Eaton Method
Estimate pore pressure from sonic, resistivity, or d-exponent logs using the Eaton method.
ReadHydrostatic Pressure
Calculate hydrostatic pressure from mud weight and true vertical depth for drilling operations.
ReadKill Sheet Calculator
Calculate kill mud weight, ICP, FCP, and MAASP for well control operations.
ReadMAASP Calculator
Calculate maximum allowable annular surface pressure to prevent fracturing at the casing shoe.
ReadMud Weight Calculator
Convert mud weight units, calculate barite additions, and determine safe drilling fluid density.
ReadProduction Engineering
Beggs-Brill Multiphase Flow
Calculate pressure drop for two-phase gas-liquid flow in pipes at any inclination using the Beggs-Brill correlation.
ReadESP Sizing Calculator
Calculate total dynamic head, number of stages, and motor HP for electrical submersible pump design.
ReadErosional Velocity API RP 14E
Calculate maximum allowable fluid velocity and minimum pipe size using API RP 14E.
ReadGas Lift Valve Spacing
Calculate gas lift valve depths, opening pressures, and injection rates for artificial lift design.
ReadIPR Vogel Darcy Fetkovich
Calculate inflow performance relationships using Vogel, Darcy PI, and Fetkovich methods.
ReadMoody Chart Colebrook-White
Calculate Darcy friction factor and pipe pressure loss using the Colebrook-White equation.
ReadNodal Analysis Calculator
Find the well operating point by intersecting IPR and VLP curves for production optimization.
ReadRod Pump Sucker Rod Sizing
Calculate pump displacement, rod loads, polished rod HP, and volumetric efficiency for beam pumping.
ReadParaffin & Wax Deposition
Predict wax appearance temperature, deposition rate, and optimize treatment schedules using Singh and Matzain models.
ReadFlow Assurance
Asphaltene Screening
Rank crude oils for asphaltene precipitation risk using SARA CII, de Boer screening, and Hirschberg-style onset flags.
ReadHydrate Dissociation P-T Curve
Generate hydrate equilibrium screening curves from gas composition and estimate MEG or methanol inhibitor depression.
ReadMultiphase Sand Erosion Velocity
Screen multiphase piping with API RP 14E erosional velocity and sand-loaded Salama limits.
ReadEconomics Engineering
Operating Netback Calculator
Calculate per-barrel profitability by subtracting royalties, LOE, and transport from realized price.
ReadPV10 Calculator
Calculate present value of proved reserves at 10% discount rate per SEC standards.
ReadWell Economics NPV IRR
Calculate NPV, IRR, payout period, and breakeven price for oil and gas well investments.
ReadWater Disposal Economics
Calculate produced water disposal costs, compare trucking vs pipeline vs SWD well, and find the economic limit.
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