PetroCalcHubFree
Browse
Reservoir EngineeringPVT Properties

Gas Formation Volume Factor Calculator

Bg=0.02827zTPB_g = 0.02827 \frac{zT}{P}

Enter z-factor, reservoir temperature, and reservoir pressure. The calculator returns gas formation volume factor.

Tabular solver

Inputs

Defaults provide a quick field-unit example for the equation.

3 variables

Calculation runs locally with the shared TypeScript engine.

Formula reference

Gas formation volume factor converts gas volume between reservoir conditions and standard surface conditions using pressure, temperature, and gas z-factor.

View formula, units, and source

Assumptions

  • Gas z-factor is known or estimated separately.
  • Pressure and temperature units match the equation form.
  • Gas behavior is represented by the real-gas relationship used by the formula.

Common mistakes

  • Using Fahrenheit instead of absolute temperature where required.
  • Mixing psia and psig.
  • Using an assumed z-factor outside its valid pressure-temperature range.