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
| Name | Input Value - Unit | Converted Value | Validity | Link to Calculation Page | |||
|---|---|---|---|---|---|---|---|
| Temperature | 677.67 | °R | |||||
| Pressure | 3200 | psi | |||||
| Solution Gas/Oil Ratio @ Pb (Rs,b) | 943 | SCF/STB | |||||
| Solution Gas/Oil Ratio (Rs) More Details | 500 | SCF/STB | Oil Gas Solubility (Rs) | ||||
| Stock Tank Oil Specific Gravity (ɣo) More Details | 44.2 | deg API | Saturated Oil Density (ρo,s) | ||||
| Bubble Point Pressure (Pb) More Details | 3045 | psi | Bubble Point Pressure (Pb) | ||||
| Solution Gas Specific Gravity (ɣg) More Details | 0.781 | SG | Solution Gas Specific Gravity (ɣg) | ||||
| Separator Pressure Actual separator pressure (two stage separation) More Details | 200 | psi | |||||
| Separator Temperature Actual separator temperature (two stage separation) More Details | 519.67 | °R | |||||
| Oil Formation Volume Factor (Bo) Saturated oil formation volume factor (Bo,s) More Details | 1.57 | bbl/STB | Saturated Oil Formation Volume Factor (Bo,s) | ||||
| Gas Formation Volume Factor (Bg) Saturated gas formation volume factor | 0.001936 | bbl/scf | |||||
| CALCULATE | |||||||
Results | |||||||
| Correlation | Calculated Value | Warnings | Remarks | ||||
| 1-McCain(1) | 0.0001044 | 1/psi | |||||
| 2-McCain(2) | 0.0001048 | 1/psi | |||||
| 3-Petrosky and Farshad | 0.00007563 | 1/psi | Gulf of Mexico crude oil system Co range is 3.5E-6 to 24.64E-6 | ||||
| 4-Vasquez and Beggs | 0.0001017 | 1/psi | |||||
| 5-De Ghetto et al | 0 | 1/psi | Co range is 3.02E-6 to 43E-6 | ||||
| 6-Standing | 0.0001939 | 1/psi | |||||