Pseudo-steady state radial flow equation

Input(s)

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

h: Thickness of Reservoir (ft)

$P_{i}$: Average Reservoir Pressure (psi)

$P_{w f}$: Well Flowing Pressure (psi)

B: Formation Volume Factor (bbl/STB)

$\mu$: Viscosity $(\mathrm{cP})$

$r_{e}$: Drainage Radius (ft)

$r_{w}$: Wellbore Radius (ft)

Output(s)

$Q$: Flow Rate (STB/day)

Formula(s)

$$ Q=\frac{0.00708 * k * h *\left(P_{i}-P_{w f}\right)}{B * \mu *\left(\ln \left(\frac{r_{e}}{r_{w}}\right)-0.75\right)} $$

Reference(s)

Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 1, Page: 33 .