van Everdingen-Hurst Water Influx Constant Calculator
Calculate the van Everdingen-Hurst aquifer influx constant from aquifer geometry and rock-fluid properties. Use the result with a compatible dimensionless influx model.
Calculation context and source notes
Water Influx Constant for van Everdingen-Hurst Aquifer calculates water influx constant for material balance workflows in reservoir engineering. The page keeps the declared variables, units, source relationship, and output definition visible for technical review.
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.
Solves for
B_aq (bbl/psi)
Best next page
Formula, variables, and sourceRelated source-backed guides
Formula, variables, and default calculation
Reproducible default result
With the default values shown below, the calculation returns B_aq = 644.544 bbl/psi. Defaults demonstrate the implementation; they are not recommended field values.
0.2
0.000008
3000
40
1
Input definitions
phi
fractionAquifer Porosity
c_t
1/psiTotal Aquifer Compressibility
r_e
ftAquifer Radius
h
ftAquifer Thickness
f
fractionEncroachment Angle Fraction of 360 Degrees
Output definitions
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
Engineering use, assumptions, and limits
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.
Frequently asked questions
What inputs does the Water Influx Constant for van Everdingen-Hurst Aquifer calculator need?
The calculation uses Aquifer Porosity (phi), Total Aquifer Compressibility (c_t), Aquifer Radius (r_e), Aquifer Thickness (h), Encroachment Angle Fraction of 360 Degrees (f). Enter values on the units shown beside each field.
What result does this calculator return?
The primary result is water influx constant in bbl/psi. The formula section shows the declared relationship, variables, and a reproducible default calculation.
What should I check before using the result?
Confirm the unit basis, source applicability, and input quality. The calculation does not replace a full engineering model or operating procedure. Mixing unit systems without converting the inputs.
Source and record status
Source metadata identifies the relationship implemented by the calculator. Check the cited edition, unit basis, and scope against the engineering case before operational use.
Ahmed, T. and McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter 4, Page 310.
Open source reference