Skin factor

Input(s)

$k_{s}$: Permeability of damaged zone $(\mathrm{mD})$

$r_{s}$: Radius of damaged zone $(\mathrm{ft})$

$r_{w}$ : Radius of wellbore (ft)

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

Output(s)

s: Skin (dimensionless)

Formula(s)

$$ s=\left(\frac{k}{k_{s}}-1\right) * \ln \left(\frac{r_{s}}{r_{w}}\right) $$

Reference(s)

Fundamental Principles of Reservoir Engineering, Towler, Page: 62.