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 .