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

where

$\begin{array}{l}q\end{array}$	total sandface flowrate ( $\begin{array}{l}q=q_t\end{array}$ )
$\begin{array}{l}p_e\end{array}$	drain-boundary formation pressure , $\begin{array}{l}p_e = \frac{1}{L_e} \int_0^{L_e} p(x,y,z) dl\end{array}$
$\begin{array}{l}p_{wf}\end{array}$	bottom hole pressure at sandface

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