Phase Behavior and ThermodynamicsPVT PropertiesCalculation record

Al-Marhoun Solution Gas-Oil Ratio from Bubble Point Pressure Calculator

R_{sb}=\left[\frac{p_b\gamma_g^{1.87784}}{0.00538088\gamma_o^{3.1437}(T+459.67)^{1.32657}}\right]^{1/0.715082}

Enter the declared phase behavior and thermodynamics inputs below to solve R_sb. Variable definitions, units, the default calculation, and the available source trail are included on this page.

Tabular solver

Extended guidance in preparation

What is available in this record

This record provides the functioning calculator, formula, declared variables and units, a reproducible default result, and the available citation metadata. A separately written engineering interpretation has not yet been published for this calculation.

Formula reference

Formula, variables, and default calculation

R_{sb}=\left[\frac{p_b\gamma_g^{1.87784}}{0.00538088\gamma_o^{3.1437}(T+459.67)^{1.32657}}\right]^{1/0.715082}

Reproducible default result

With the default values shown below, the calculation returns R_sb = 600 SCF/STB. Defaults demonstrate the implementation; they are not recommended field values.

p_bpsi

2511.030937021148

gamma_gfraction

0.8

gamma_ofraction

0.85

T°F

180

Input definitions

p_b

psi

Bubble Point Pressure

gamma_g

fraction

Gas Specific Gravity

gamma_o

fraction

Stock-Tank Oil Specific Gravity

T

°F

Reservoir Temperature

Output definitions

R_sb

SCF/STB

Solution Gas-Oil Ratio at Bubble Point

p_b

psi

Bubble Point Pressure

Source and record status

Source metadata identifies the relationship implemented by the calculator. Check the cited edition, unit basis, and scope against the engineering case before operational use.

reviewed

Al-Marhoun, M.A. 1988. PVT Correlations for Middle East Crude Oils, Journal of Petroleum Technology, SPE-13718-PA.

Open source reference