Additional pressure drop in the skin zone

Input(s)

$Q_{o}$: Well Flow Rate (STB/day)

$B_{o}$: Oil Formation Volume Factor $(\mathrm{bbl} / \mathrm{STB})$

$\mu_{o}$: Oil Viscosity $(\mathrm{cP})$

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

$\mathrm{h}$: Thickness $(\mathrm{ft})$

S: Skin (dimensionless)

Output(s)

$\Delta P_{\text {skin }}$: Pressure Drop Due to Skin (psi)

Formula(s)

$$ \Delta P_{\text {skin }}=\left(\frac{141.2 * Q_{o} * B_{o} * \mu_{o}}{k * h}\right) * S $$

Reference(s)

Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 1, Page: 37.