Phase Behavior and ThermodynamicsGas Properties
Lee-Gonzalez-Eakin Gas Viscosity Formula
Lee-Gonzalez-Eakin Gas Viscosity calculates gas viscosity for gas properties workflows in phase behavior and thermodynamics.
How engineers use this formula
Use this formula when the listed inputs (gamma_g, P, z, R, T) are known and the assumptions behind the cited gas 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_g equals 0.019129 cP.
gamma_gdimensionless
0.65
Ppsia
3000
zdimensionless
0.85
Rpsia ft³/(lbmol °R)
10.732
T°R
600
Inputs
gamma_g
dimensionlessGas Specific Gravity Relative to Air
P
psiaPressure
z
dimensionlessGas Compressibility Factor
R
psia ft³/(lbmol °R)Gas Constant
T
°RTemperature
Outputs
mu_g
cP
Gas Viscosity
Source and review
reviewedLee, A.L., Gonzalez, M.H. and Eakin, B.E. 1966. The Viscosity of Natural Gases, Journal of Petroleum Technology, SPE-1340-PA.
Source