Water Sandface Productivity Index

(1)	$\begin{array}{l}\displaystyle J_g = \frac{q_g}{p_{e,g}-p_{wf}}\end{array}$

where

$\begin{array}{l}q_w\end{array}$	Water sandface flowrate
$\begin{array}{l}p_{e,w}\end{array}$	Water phase formation pressure
$\begin{array}{l}p_{wf}\end{array}$	Sandface bottom hole pressure

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