Phase Behavior and ThermodynamicsPVT Properties
Solution Gas-Oil Ratio - Beggs-Standing Correlation Below Bubble Point Formula
Solution Gas-Oil Ratio - Beggs-Standing Correlation Below Bubble Point calculates solution gas-oil ratio for pvt properties workflows in phase behavior and thermodynamics.
How engineers use this formula
Use this formula when the listed inputs (T, gamma_g, p, p_api) 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_so equals 545.941943 SCF/STB.
T°F
180
gamma_gfraction
0.8
ppsi
2500
p_apiAPI
30
Inputs
T
°FTemperature
gamma_g
fractionProduced Gas Specific Gravity
p
psiPressure
p_api
APIAPI Gravity Term
Outputs
R_so
SCF/STB
Solution Gas-Oil Ratio
Y_g
dimensionless
Beggs-Standing Temperature and API Constant
gamma_g
fraction
Produced Gas Specific Gravity
p
psi
Pressure
T
°F
Temperature
p_api
API
API Gravity Term
Source and review
reviewedCraft, B.C. and Hawkins, M.F. Applied Petroleum Reservoir Engineering, Second Edition, Page 33.
Source