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Drain-area Productivity Index (Jr)

Created by Arthur Aslanyan (Nafta College), last modified on Apr 30, 2019

(1)	$\begin{array}{l}\displaystyle J_r = \frac{q}{\|p_r - p_{wf}\|}\end{array}$

where

$\begin{array}{l}q\end{array}$	flowrate (the specification of which may differ, see below)
$\begin{array}{l}p_r\end{array}$	field-average formation pressure, $\begin{array}{l}p_r = \frac{1}{V_e} \iint_{A_e} p(x,y,z) dV\end{array}$
$\begin{array}{l}p_{wf}\end{array}$	bottom hole pressure at sandface

See Also

Petroleum Industry / Upstream / Production / Subsurface Production / Subsurface E&P Disciplines / Production Technology / Productivity Index

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