Phase Behavior and ThermodynamicsPVT PropertiesCalculation record

Glaso Solution Gas-Oil Ratio from Pressure Calculator

R_s=\gamma_g\left(\frac{p_b^*API^{0.989}}{T^{0.172}}\right)^{1/0.816}

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.

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_s=\gamma_g\left(\frac{p_b^*API^{0.989}}{T^{0.172}}\right)^{1/0.816}

Reproducible default result

With the default values shown below, the calculation returns R_s = 545.728847 SCF/STB. Defaults demonstrate the implementation; they are not recommended field values.

ppsi

2500

gamma_gfraction

0.8

APIAPI

Tdeg F

180

Input definitions

p

psi

Pressure

gamma_g

fraction

Gas Specific Gravity

API

Oil API Gravity

T

deg F

Reservoir Temperature

Output definitions

R_s

SCF/STB

Solution Gas-Oil Ratio

x_glaso_pb

dimensionless

Glaso Bubble Point Quadratic Root

p_b_star

dimensionless

Glaso Bubble Point Correlating Parameter

p

psi

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

Oil Correlations - Glaso (North Sea Oil), Glaso, O., IHS Harmony

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

Open source reference