van Everdingen-Hurst Water Influx Calculator
Calculate one van Everdingen-Hurst water-influx step from the aquifer constant, pressure change, and dimensionless influx response. Preserve the model's pressure and time basis.
Calculation context and source notes
van Everdingen-Hurst Single-Step Water Influx calculates cumulative water influx for pressure step 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 (B_aq, Delta_p, W_eD) are known and the assumptions behind the cited material balance relationship match the engineering case being checked.
Solves for
W_e (bbl)
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 W_e = 12,597 bbl. Defaults demonstrate the implementation; they are not recommended field values.
20.4
5
123.5
Input definitions
B_aq
bbl/psiAquifer Influx Constant
Delta_p
psiPressure Drop Increment
W_eD
dimensionlessDimensionless Cumulative Water Influx
Output definitions
W_e
Cumulative Water Influx for Pressure Step
B_aq
Aquifer Influx Constant
Delta_p
Pressure Drop Increment
W_eD
Dimensionless Cumulative Water Influx
Engineering use, assumptions, and limits
Use this formula when the listed inputs (B_aq, Delta_p, W_eD) 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 van Everdingen-Hurst Single-Step Water Influx calculator need?
The calculation uses Aquifer Influx Constant (B_aq), Pressure Drop Increment (Delta_p), Dimensionless Cumulative Water Influx (W_eD). Enter values on the units shown beside each field.
What result does this calculator return?
The primary result is cumulative water influx for pressure step in bbl. 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.
Petroleum Office. Aquifer Models, van Everdingen-Hurst cumulative influx; Ahmed water-influx worked example.
Open source reference