Skin factor by Hawkins method
Input(s)
\(\mathrm{k}\): Permeability of Reservoir \((\mathrm{mD})\)
\(k_{s}\) : Permeability of Skin Zone Near Wellbore (mD)
\(r_{w}\): Radius of Wellbore (ft)
\(r_{s}\): Radius of Skin Zone \((\mathrm{ft})\)
Output(s)
S: Skin Factor (dimensionless)
Formula(s)
\[
S=\left(\left(\frac{k}{k_{s}}\right)-1\right) * \ln \left(\frac{r_{s}}{r_{w}}\right)
\]
Reference(s)
Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 1, Page: 37.