Phase Behavior and ThermodynamicsFluid Properties
Formation Water Density at Reservoir Conditions Formula
Formation Water Density at Reservoir Conditions calculates formation water density at reservoir conditions for fluid properties workflows in phase behavior and thermodynamics.
How engineers use this formula
Use this formula when the listed inputs (rho_wSC, B_w) 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, rho_wR equals 63.164706 lbm/ft3.
rho_wSClbm/ft3
64.428
B_wres bbl/STB
1.02
Inputs
rho_wSC
lbm/ft3Formation Water Density at Standard Conditions
B_w
res bbl/STBWater Formation Volume Factor
Outputs
rho_wR
lbm/ft3
Formation Water Density at Reservoir Conditions
rho_wSC
lbm/ft3
Formation Water Density at Standard Conditions
B_w
res bbl/STB
Water Formation Volume Factor
Source and review
reviewedWater density, McCain, W.D. Jr., Pengtools
McCain, W.D. Jr. 1990. Properties of Petroleum Fluids; Pengtools Water Density summary.
Source