Half of the total length of the hydraulically induced vertical plane fracture .
For the fractured vertical well the geometrical skin-factor S_G is related to Fracture half-length X_f as:
(1) | S_G= -\ln \left(\frac{X_f}{r_w} \right) + \frac{1.65 -0.328 \, u + 0.116 \, u^2}{1+0.18 \, u + 0.064 \, u^2 +0.05 \, u^3} |
where
u = \ln F_{CD} |
In simple case:
(2) | S_G= -\ln \left(\frac{X_f}{2\, r_w} \right) |
See Also
Petroleum Industry / Upstream / Well / Well-Reservoir Contact (WRC) / Hydraulic Fracture