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Phase Behavior and ThermodynamicsPVT PropertiesCalculation record

Glaso Solution Gas-Oil Ratio from Saturated Oil FVF Calculator

Rs=Bo∗−0.968T(γg/γo)0.526R_s=\frac{B_o^*-0.968T}{(\gamma_g/\gamma_o)^{0.526}}

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

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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

Rs=Bo∗−0.968T(γg/γo)0.526R_s=\frac{B_o^*-0.968T}{(\gamma_g/\gamma_o)^{0.526}}

Reproducible default result

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

B_oRB/STB

1.3210909284519903

gamma_gfraction

0.8

gamma_ofraction

0.85

Tdeg F

180

Input definitions

B_o

RB/STB

Saturated Oil Formation Volume Factor

gamma_g

fraction

Gas Specific Gravity

gamma_o

fraction

Stock-Tank Oil Specific Gravity

T

deg F

Reservoir Temperature

Output definitions

R_s

SCF/STB

Solution Gas-Oil Ratio

A_glaso_fvf

dimensionless

Glaso Saturated Oil FVF Logarithmic Exponent

x_glaso_fvf

dimensionless

Glaso FVF Correlating-Parameter Logarithm

B_o_star

dimensionless

Glaso Oil Formation Volume Factor Correlating Parameter

B_o

RB/STB

Saturated Oil Formation Volume Factor

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

Oil Formation Volume Factor (Bo) Correlations, Glaso, O., Petroleum Office

Glaso, O. 1980. Generalized Pressure-Volume-Temperature Correlations, Journal of Petroleum Technology, SPE-8016-PA; Petroleum Office oil FVF correlations.

Open source reference