Incremental Density in Wellbore Interval - Completion and Workover Fluids Formula
Incremental Density in Wellbore Interval - Completion and Workover Fluids calculates incremental wellbore fluid density change for well performance workflows in production engineering.
How engineers use this formula
Use this formula when the listed inputs (B, g_p, Delta_D, A, g_T) are known and the assumptions behind the cited well performance 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, Delta_rho_i equals 8.9955 lbm/bbl.
0.02
0.45
1000
0.0003
0.015
Inputs
B
lbm/gal/1000 psiPressure Compressibility Coefficient
g_p
psi/ftPressure Gradient
Delta_D
ftDepth Interval
A
degF^-1Thermal Expansion Coefficient
g_T
degF/ftTemperature Gradient
Outputs
Delta_rho_i
Incremental Wellbore Fluid Density Change
B
Pressure Compressibility Coefficient
g_p
Pressure Gradient
Delta_D
Depth Interval
A
Thermal Expansion Coefficient
g_T
Temperature Gradient
Source and review
reviewedBridges, K.L. 2000. Completion and Workover Fluids, Vol. 19, Society of Petroleum Engineers, Page 46.
Source