Time to the end of infinite-acting period for a well in a circular reservoir
Input(s)
\(\emptyset\): Porosity (fraction)
\(\mu\): Viscosity \((\mathrm{cP})\)
\(\mathrm{c}_{\mathrm{t}}\): Total Compressibility \((1 / \mathrm{psi})\)
A: Well Drainage Area \(\left(\mathrm{ft}^{2}\right)\)
k: Permeability \((\mathrm{mD})\)
Output(s)
\(t_{\text {eia }}\): Time to the End of Infinite-acting Period (h)
Formula(s)
\[
\mathrm{t}_{\mathrm{eia}}=\frac{380 * \emptyset * \mu * \mathrm{c}_{\mathrm{t}} * \mathrm{~A}}{\mathrm{k}}
\]
Reference(s)
Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 1, Page: 50 .