Phase Behavior and ThermodynamicsFluid Properties
Vasquez-Beggs Oil Viscosity Above Bubble Point Formula
Vasquez-Beggs Oil Viscosity Above Bubble Point calculates oil viscosity above bubble point for fluid properties workflows in phase behavior and thermodynamics.
How engineers use this formula
Use this formula when the listed inputs (mu_ob, p, p_b) are known and the assumptions behind the cited fluid 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, mu_o equals 1.259688 cP.
mu_obcP
1.2
ppsi
3000
p_bpsi
2500
Inputs
mu_ob
cPOil Viscosity at Bubble Point
p
psiPressure
p_b
psiBubble Point Pressure
Outputs
mu_o
cP
Oil Viscosity Above Bubble Point
m_vasquez_beggs
dimensionless
Vasquez-Beggs Pressure Exponent
mu_ob
cP
Oil Viscosity at Bubble Point
p_b
psi
Bubble Point Pressure
Source and review
reviewedCraft, B.C., Hawkins, M. and Terry, R.E. 1991. Applied Petroleum Reservoir Engineering, 2nd Edition, Page 41.
Source