Water Influx Constant for van Everdingen-Hurst Aquifer Formula
Water Influx Constant for van Everdingen-Hurst Aquifer calculates water influx constant for material balance workflows in reservoir engineering.
How engineers use this formula
Use this formula when the listed inputs (phi, c_t, r_e, h, f) 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, B_aq equals 644.544 bbl/psi.
0.2
0.000008
3000
40
1
Inputs
phi
fractionAquifer Porosity
c_t
1/psiTotal Aquifer Compressibility
r_e
ftAquifer Radius
h
ftAquifer Thickness
f
fractionEncroachment Angle Fraction of 360 Degrees
Outputs
B_aq
Water Influx Constant
phi
Aquifer Porosity
c_t
Total Aquifer Compressibility
r_e
Aquifer Radius
h
Aquifer Thickness
f
Encroachment Angle Fraction of 360 Degrees
Source and review
reviewedAhmed, T. and McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter 4, Page 310.
Source