Flow coefficient during drawdown
Input(s)
\(p_{w f}\): Wellbore Flowing Pressure (psi)
\(P_{i}\): Average Pressure (psi)
\(\Delta p_{\text {skin }}\): Pressure Drop Due to Skin (psi)
Output(s)
E: Flow Coeffcient (fraction)
Formula(s)
\[
E=\frac{P_{i}-p_{w f}-\Delta p_{s k i n}}{P_{i}-p_{w f}}
\]
Reference(s)
Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 1, Page: 64