Time to pseudo-steady state (single well-circular reservoir)

Input(s)

Ø: Porosity (fraction)

$\mu$: Viscosity (cP)

$c_{t}$: Compressibility (/psi)

$r_{e}$: Radius of reservoir $(\mathrm{ft})$

$\mathrm{k}$: Permeability $(\mathrm{mD})$

Output(s)

$\mathrm{t}_{\mathrm{pss}}$: Pseudo steady state $(\mathrm{h})$

Formula(s)

$$ \text { tpss }=1200 * \varnothing * \mu * c_{t} * \frac{r_{e}^{2}}{k} $$

Reference(s)

Pressure Buildup and Flow Tests in Wells, Matthews \& Russell, Page: 13.