Phase Behavior and ThermodynamicsPVT Properties
Glaso Bubble Point Pressure Formula
Glaso Bubble Point Pressure calculates bubble point pressure for pvt properties workflows in phase behavior and thermodynamics.
How engineers use this formula
Use this formula when the listed inputs (R_sb, gamma_g, API, 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, p_b equals 2,706.411959 psi.
R_sbSCF/STB
600
gamma_gfraction
0.8
APIAPI
35
T°F
180
Inputs
R_sb
SCF/STBSolution Gas-Oil Ratio at Bubble Point
gamma_g
fractionGas Specific Gravity
API
APIOil API Gravity
T
°FReservoir Temperature
Outputs
p_b
psi
Bubble Point Pressure
p_b_star
dimensionless
Glaso Bubble Point Correlating Parameter
R_sb
SCF/STB
Solution Gas-Oil Ratio at Bubble Point
Source and review
reviewedGlaso, O. 1980. Generalized Pressure-Volume-Temperature Correlations, Journal of Petroleum Technology, SPE-8016-PA.
Source