Skin factor due to reduced crushed-zone permeability
Input(s)
\(h_{p}\): Perforation interval (ft)
\(\mathrm{kd}\) : Damage Zone permeability \((\mathrm{mD})\)
kdp: Crushed Zone Permeability \((\mathrm{mD})\)
\(\mathrm{k}\): Permeability of Formation \((\mathrm{mD})\)
\(r_{d p}\): Crushed Zone radius \((\mathrm{ft})\)
\(r_{p}\): Perforation Radius \((\mathrm{ft})\)
Lp: Depth of Penetration (ft)
N: Total Number of Perforations (number)
Output(s)
sc: Skin Factor due to Reduced Crushed-Zone Permeability (dimensionless)
Formula(s)
\[
s c=\left(\frac{k}{k d p}-\frac{k}{k d}\right) * 12 * \frac{h_{p}}{N * L p} * \ln \left(\frac{r_{d p}}{r_{p}}\right)
\]
Reference(s)
Horizontal Well Technology, Joshi, Page: 504.