Water influx constant for the van Everdingen and Hurst unsteady-state model

Input(s)

$c_{t}$: Total Aquifer Compressibility (1/psi)

$\emptyset$: Porosity of the Aquifer (fraction)

$\mathrm{r}_{\mathrm{e}}$: Radius of Reservoir $(\mathrm{ft})$

$\mathrm{h}$: Thickness of the Aquifer (ft)

f: Encroachment Angle (Divided by 360)

Output(s)

B: Water Influx (bbl)

Formula(s)

$$ \mathrm{B}=1.119 * \emptyset * \mathrm{c}_{\mathrm{t}} *\left(\mathrm{r}_{\mathrm{e}}^{2}\right) * \mathrm{~h} * \mathrm{f} $$

Reference(s)

Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 4, Page: 310 .