Phase Behavior and ThermodynamicsGas Properties
Sutton Pseudo-Critical Gas Properties Formula
Sutton Pseudo-Critical Gas Properties calculates pseudo-critical temperature for gas properties workflows in phase behavior and thermodynamics.
How engineers use this formula
Use this formula when the listed inputs (gamma_g) 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, T_pc equals 365.11 °R.
gamma_gdimensionless
0.65
Inputs
gamma_g
dimensionlessGas Specific Gravity Relative to Air
Outputs
T_pc
°R
Pseudo-Critical Temperature
P_pc
psia
Pseudo-Critical Pressure
Source and review
reviewedSutton, R.P. 1985. Compressibility Factors for High-Molecular-Weight Reservoir Gases, SPE-14265-MS.
Source