Equivalent skin factor in fractured wells

Input(s)

$x_{f}$: Fracture Half Length $(\mathrm{ft})$

$r_{w}$: Wellbore Radius ( $\mathrm{ft}$ )

Output(s)

$S_{f}$: Equivalent Skin (unitless)

Formula(s)

$$ S_{f}=0.7-\ln \left(\frac{x_{f}}{r_{w}}\right) $$

Reference(s)

Boyun, G., William, C., \& Ali Ghalambor, G. (2007). Petroleum Production Engineering: A Computer-Assisted Approach, Page: 17/257.