Phase Behavior and ThermodynamicsFluid Properties
Osif Water Isothermal Compressibility Formula
Osif Water Isothermal Compressibility calculates water isothermal compressibility for fluid properties workflows in phase behavior and thermodynamics.
How engineers use this formula
Use this formula when the listed inputs (P, C_mg_l, 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, c_w equals 0.000003 1/psi.
Ppsia
3000
C_mg_lmg/L
50000
Tdeg F
220
Inputs
P
psiaPressure
C_mg_l
mg/LWater Salinity or Solids Concentration
T
deg FTemperature
Outputs
c_w
1/psi
Water Isothermal Compressibility
P
psia
Pressure
C_mg_l
mg/L
Water Salinity or Solids Concentration
T
deg F
Temperature
Source and review
reviewedWater compressibility, McCain, W.D. Jr., Pengtools
McCain, W.D. Jr. 1991. Reservoir-Fluid Property Correlations-State of the Art; Pengtools Water Compressibility summary.
Source