Undersaturated oil isothermal compressibility factor (Co,us)

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.

Above bubblepoint pressure, oil volume changes as a function of isothermal compressibility only.

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

Correlations

  • 1-Dindoruk and Christman
  • 2-Petrosky and Farshad
  • 3-Emad
  • 4-Ahmed
  • 5-Vasquez and Beggs
  • 6-De Ghetto et al
  • 3-Marhoun

Input Parameters

NameInput Value - UnitConverted ValueValidity CheckLink to Calculation Page
Solution Gas/Oil Ratio (Rs) Solution GOR at bubble point pressure (scf/STB)
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scf/STB

Oil Gas Solubility (Rs)
Solution Gas Specifc Gravity (ɣg) More Details

SG

Solution Gas Specific Gravity (ɣg)
Temperature

°R

Stock Tank Oil Specific Gravity (ɣo) More Details

deg API

Saturated Oil Density (ρo,s)
Pressure

psi

Separator Pressure Actual separator pressure (two stage separation)
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psi

Separator Temperature Actual separator temperature (two stage separation)
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°R

Bubble Point Pressure (Pb) More Details

psi

Bubble Point Pressure (Pb)
Oil Formation Volume Factor (Bo) Saturated oil formation volume factor (Bo,s)
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bbl/STB

Saturated Oil Formation Volume Factor (Bo,s)
CALCULATE

Results

CorrelationCalculated ValueWarningsRemarks
1-Dindoruk and Christman1/psiCo range is 5.02E-6 to 31.91E-6
2-Petrosky and Farshad1/psiGulf of Mexico crude oil system Co range is 3.5E-6 to 24.64E-6
3-Emad1/psiMishrif reservoir in the southern Iraqi oil fields Co range is 5.4E-6 to 13.8E-6
4-Ahmed1/psi
5-Vasquez and Beggs1/psi
6-De Ghetto et al1/psiCo range is 3.02E-6 to 43E-6
3-Marhoun1/psiCo range is 3.45E-6 to 31.11E-6