Reservoir EngineeringPressure Transient Analysis
Wellbore Storage Coefficient from Fluid Volume Change Formula
Wellbore Storage Coefficient from Fluid Volume Change calculates wellbore storage coefficient for pressure transient analysis workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (delta_V_m, delta_P) are known and the assumptions behind the cited pressure transient analysis 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 equals 0.06 bbl/psi.
delta_V_mbbl
12
delta_Ppsi
200
Inputs
delta_V_m
bblChange in wellbore fluid volume
delta_P
psiChange in pressure
Outputs
C
bbl/psi
Wellbore storage coefficient
delta_V_m
bbl
Change in wellbore fluid volume
delta_P
psi
Change in pressure
Source and review
reviewedAhmed, T. and McKinney, P. D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter 1, Page 49.
Source