Phase Behavior and ThermodynamicsPVT Properties
Beggs-Standing Oil Formation Volume Factor Below Bubble Point Formula
Beggs-Standing Oil Formation Volume Factor Below Bubble Point calculates oil formation volume factor for pvt properties workflows in phase behavior and thermodynamics.
How engineers use this formula
Use this formula when the listed inputs (R_s, gamma_g, gamma_o, T) 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, B_o equals 1.354779 RB/STB.
R_sSCF/STB
600
gamma_gfraction
0.8
gamma_ofraction
0.85
T°F
180
Inputs
R_s
SCF/STBSolution Gas-Oil Ratio
gamma_g
fractionGas Specific Gravity
gamma_o
fractionOil Specific Gravity
T
°FTemperature
Outputs
B_o
RB/STB
Oil Formation Volume Factor
F_beggs_standing
dimensionless
Beggs-Standing Formation Volume Factor Correlating Parameter
R_s
SCF/STB
Solution Gas-Oil Ratio
T
°F
Temperature
Source and review
reviewedCraft, B.C., Hawkins, M. and Terry, R.E. 1991. Applied Petroleum Reservoir Engineering, 2nd Edition, Page 37.
Source