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Gas surface productivity index

Created by Arthur Aslanyan (Nafta College), last modified on Nov 15, 2018

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Productivity Index of the dry gas with surface flowrate measured at separator

(1)	$\begin{array}{l}\displaystyle J_G = \frac{q_G}{p_r-p_{wf}}\end{array}$

where

$\begin{array}{l}q_G\end{array}$	Gas surface flowrate
$\begin{array}{l}p_r\end{array}$	Field-average formation pressure
$\begin{array}{l}p_{wf}\end{array}$	Sandface bottom hole pressure

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