Petroleum engineering formulas and calculators
Search source-linked equations, run unit-aware calculators, and review worked examples for drilling, reservoir, production, PVT, petrophysics, geomechanics, and hydraulic fracturing workflows.
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engineering disciplines
Most used calculators
Common drilling, well-control, production, PVT, and petrophysics workflows.
Hydrostatic Pressure from Mud Weight
Well Control
Equivalent Circulating Density
Drilling Hydraulics
Initial Circulating Pressure
Well Control
Maximum Allowable Annular Surface Pressure from Shoe EMW
Well Control
Kill Weight Mud Determination - Moore Equation
Well Control
Kick Analysis - Shut-In Drill Pipe Pressure
Well Control
Vogel Inflow Performance Relationship
Inflow Performance
Productivity Index and Straight-Line IPR
Inflow Performance
Source-verified workflow guides
Use these when you need context before choosing a calculator.
Well Control Calculation Workflow
A source-checked well control calculation workflow for hydrostatic pressure, kill mud weight, initial circulating pressure, final circulating pressure, and MAASP checks.
Drilling Hydraulics Formulas
A drilling hydraulics formula guide for ECD, annular pressure loss, annular velocity, pump output, and pressure-window checks.
Reservoir Engineering Formula Guide
A reservoir engineering formula guide for Darcy flow, straight-line productivity index, Vogel IPR, material balance, and original oil in place checks.
Petroleum PVT Calculator Guide
A petroleum PVT calculator guide for gas formation volume factor, oil formation volume factor, real-gas density, API gravity, and reservoir-to-surface volume conversion checks.
Joshi Horizontal Well Productivity Guide
A source-backed guide to the Joshi horizontal well productivity equation, drainage geometry, anisotropy, effective radius, skin, and the limits of steady-state inflow screening.
Shaly Sand Water Saturation Guide
A practical comparison of Indonesian, Archie, and Simandoux water-saturation calculations for resistivity logs, with input checks for shale volume, shale resistivity, porosity, and water resistivity.
Frequently referenced formulas
Direct links to detailed equations, variables, assumptions, worked examples, sources, and matching calculators.