Saturated Oil isothermal compressibility factor (Co,s)

Oil compressibility (also called isothermal oil compressibility) is defined as the change in fluid volume with respect to the change in pressure at isothermal conditions.

Below the bubble-point pressure, the oil compressibility definition includes the compressibility of the free gas. Due to the significant difference in free gas and oil compressibility, the oil compressibility below the bubble-point pressure is dominated by the free gas compressibility.

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

Correlations

  • 1-McCain(1)
  • 2-McCain(2)
  • 3-Petrosky and Farshad
  • 4-Vasquez and Beggs
  • 5-De Ghetto et al
  • 6-Standing

Input Parameters

NameInput Value - UnitConverted ValueValidity CheckLink to Calculation Page
Temperature

°R

Pressure

psi

Solution Gas/Oil Ratio @ Pb (Rs,b)

scf/STB

Solution Gas/Oil Ratio (Rs) More Details

scf/STB

Oil Gas Solubility (Rs)
Stock Tank Oil Specific Gravity (ɣo) More Details

deg API

Saturated Oil Density (ρo,s)
Bubble Point Pressure (Pb) More Details

psi

Bubble Point Pressure (Pb)
Solution Gas Specific Gravity (ɣg) More Details

SG

Solution Gas Specific Gravity (ɣg)
Separator Pressure Actual separator pressure (two stage separation)
More Details

psi

Separator Temperature Actual separator temperature (two stage separation)
More Details

°R

Oil Formation Volume Factor (Bo) Saturated oil formation volume factor (Bo,s)
More Details

bbl/STB

Saturated Oil Formation Volume Factor (Bo,s)
Gas Formation Volume Factor (Bg) Saturated gas formation volume factor

bbl/scf

CALCULATE

Results

CorrelationCalculated ValueWarningsRemarks
1-McCain(1)1/psi
2-McCain(2)1/psi
3-Petrosky and Farshad1/psiGulf of Mexico crude oil system Co range is 3.5E-6 to 24.64E-6
4-Vasquez and Beggs1/psi
5-De Ghetto et al1/psiCo range is 3.02E-6 to 43E-6
6-Standing1/psi