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Phase Behavior and ThermodynamicsPVT PropertiesCalculation record

Al-Marhoun Bubble Point Pressure Calculator

pb=0.00538088Rsb0.715082γg−1.87784γo3.1437(T+459.67)1.32657p_b=0.00538088R_{sb}^{0.715082}\gamma_g^{-1.87784}\gamma_o^{3.1437}(T+459.67)^{1.32657}

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

Tabular solver

Inputs

Defaults provide a quick field-unit example for the equation.

4 variables

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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

pb=0.00538088Rsb0.715082γg−1.87784γo3.1437(T+459.67)1.32657p_b=0.00538088R_{sb}^{0.715082}\gamma_g^{-1.87784}\gamma_o^{3.1437}(T+459.67)^{1.32657}

Reproducible default result

With the default values shown below, the calculation returns p_b = 2,511.030937 psi. Defaults demonstrate the implementation; they are not recommended field values.

R_sbSCF/STB

600

gamma_gfraction

0.8

gamma_ofraction

0.85

T°F

180

Input definitions

R_sb

SCF/STB

Solution Gas-Oil Ratio at Bubble Point

gamma_g

fraction

Gas Specific Gravity

gamma_o

fraction

Stock-Tank Oil Specific Gravity

T

°F

Reservoir Temperature

Output definitions

p_b

psi

Bubble Point Pressure

R_sb

SCF/STB

Solution Gas-Oil Ratio at Bubble Point

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