McCain Pure-Water Solution Gas-Water Ratio Formula
McCain Pure-Water Solution Gas-Water Ratio calculates solution gas-water ratio for pure water for fluid properties workflows in phase behavior and thermodynamics.
How engineers use this formula
Use this formula when the listed inputs (P, T) 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, R_swp equals 14.881375 scf/STB.
3000
180
Inputs
P
psiaPressure
T
deg FTemperature
Outputs
R_swp
Solution Gas-Water Ratio for Pure Water
A_mccain_rsw
McCain Pure-Water Rsw Coefficient A
B_mccain_rsw
McCain Pure-Water Rsw Coefficient B
C_mccain_rsw
McCain Pure-Water Rsw Coefficient C
P
Pressure
Source and review
reviewedFormation Water PVT Properties, McCain, W.D. Jr., Petroleum Office, AAPG Wiki
McCain, W.D. Jr. 1991. Reservoir-Fluid Property Correlations-State of the Art; Petroleum Office Formation Water PVT Properties.
Source