Water Influx from Pot Aquifer Model Formula
Water Influx from Pot Aquifer Model calculates cumulative water influx for material balance workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (c_t, W_i, P_i, P) are known and the assumptions behind the cited material balance 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, W_e equals 70,000 bbl.
0.000007
50000000
3000
2800
Inputs
c_t
1/psiAquifer Total Compressibility
W_i
bblInitial Volume of Water in Aquifer
P_i
psiInitial Reservoir Pressure
P
psiCurrent Reservoir Pressure at Oil-Water Contact
Outputs
W_e
Cumulative Water Influx
c_t
Aquifer Total Compressibility
W_i
Initial Volume of Water in Aquifer
P_i
Initial Reservoir Pressure
P
Current Reservoir Pressure at Oil-Water Contact
Source and review
reviewedAhmed, T. Reservoir Engineering Handbook water influx chapter; ScienceDirect cumulative water influx, Pot Aquifer Model.
Source