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
| Name | Input Value - Unit | Converted Value | Validity | Link to Calculation Page | |||
|---|---|---|---|---|---|---|---|
| Solution Gas/Oil Ratio (Rs) Solution GOR at bubble point pressure (scf/STB) More Details | 943 | SCF/STB | Oil Gas Solubility (Rs) | ||||
| Solution Gas Specifc Gravity (ɣg) More Details | 0.781 | SG | Solution Gas Specific Gravity (ɣg) | ||||
| Temperature | 677.67 | °R | |||||
| Stock Tank Oil Specific Gravity (ɣo) More Details | 40 | deg API | Saturated Oil Density (ρo,s) | ||||
| Pressure | 3200 | psi | |||||
| 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 | |||||
| Bubble Point Pressure (Pb) More Details | 3045 | psi | Bubble Point Pressure (Pb) | ||||
| 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) | ||||
| CALCULATE | |||||||
Results | |||||||
| Correlation | Calculated Value | Warnings | Remarks | ||||
| 1-Dindoruk and Christman | 0.00001679 | 1/psi | Co range is 5.02E-6 to 31.91E-6 | ||||
| 2-Petrosky and Farshad | 0.00002003 | 1/psi | Gulf of Mexico crude oil system Co range is 3.5E-6 to 24.64E-6 | ||||
| 3-Emad | 0.0002326 | 1/psi | Mishrif reservoir in the southern Iraqi oil fields Co range is 5.4E-6 to 13.8E-6 | ||||
| 4-Ahmed | 0.00001499 | 1/psi | |||||
| 5-Vasquez and Beggs | 0.00002055 | 1/psi | |||||
| 6-De Ghetto et al | 0 | 1/psi | Co range is 3.02E-6 to 43E-6 | ||||
| 3-Marhoun | 0.00001009 | 1/psi | Co range is 3.45E-6 to 31.11E-6 | ||||