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.