Phase Behavior and ThermodynamicsPVT Properties
Al-Marhoun Solution Gas-Oil Ratio from Bubble Point Pressure Formula
Al-Marhoun Solution Gas-Oil Ratio from Bubble Point Pressure calculates solution gas-oil ratio at bubble point for pvt properties workflows in phase behavior and thermodynamics.
How engineers use this formula
Use this formula when the listed inputs (p_b, gamma_g, gamma_o, T) are known and the assumptions behind the cited pvt properties relationship match the engineering case being checked.
Assumptions
- Input values are representative for the well, reservoir, fluid, or equipment case being evaluated.
- The declared units match the field-unit constants used in the formula.
- The cited formula applies to the selected petroleum engineering workflow.
Limitations
- The calculation does not replace a full engineering model or operating procedure.
- Accuracy depends on the source correlation, assumptions, input quality, and unit consistency.
Common mistakes
- Mixing unit systems without converting the inputs.
- Using default example values as field recommendations.
- Applying the formula outside the source assumptions.
Default example
Using the default inputs, R_sb equals 600 SCF/STB.
p_bpsi
2511.030937021148
gamma_gfraction
0.8
gamma_ofraction
0.85
T°F
180
Inputs
p_b
psiBubble Point Pressure
gamma_g
fractionGas Specific Gravity
gamma_o
fractionStock-Tank Oil Specific Gravity
T
°FReservoir Temperature
Outputs
R_sb
SCF/STB
Solution Gas-Oil Ratio at Bubble Point
p_b
psi
Bubble Point Pressure
Source and review
reviewedAl-Marhoun, M.A. 1988. PVT Correlations for Middle East Crude Oils, Journal of Petroleum Technology, SPE-13718-PA.
Source