Gas Formation Volume Factor(Bg)

Formation volume factor of gas is defined as the volume of gas at reservoir pressure and temperature required to produce one standard volume of gas at the surface.

Engineers must compute the z-factor (from correlations if not available from laboratory measurements) and then use it in the calculation of gas formation volume factor.

Reference: PVT Property Correlations, Ahmed El-banbi, 2018

Correlations

  • 1-Dry
  • 2-Wet

Input Parameters

NameInput Value - UnitConverted ValueValidityLink to Calculation Page
Temperature

220

°f

Pressure

2100

psi

Compressibility Factor (Z-factor)

0.855

-

Gas Compressibility Factor (Z-Factor)
Condensate API

50

deg API

Solution Gas/Oil Ratio (Rs) More Details

150000

SCF/STB

Oil Gas Solubility (Rs)
CALCULATE

Results

CorrelationCalculated ValueWarningsRemarks
1-Dry0.00781cu ft/scf
2-Wet0.00541cu ft/scf