(1)	$\begin{array}{l}\displaystyle p_D =\frac{\sigma \cdot \Delta p}{q_t}\end{array}$

where

$\begin{array}{l}\Delta p\end{array}$	pressure drop
$\begin{array}{l}q_t\end{array}$	total sandface flowrate
$\begin{array}{l}\sigma\end{array}$	reservoir transmissibility

(2)	$\begin{array}{l}\displaystyle p_D =\frac{\sigma \cdot \Delta p}{141.2 \, q_t}\end{array}$

where

$\begin{array}{l}\Delta p\end{array}$	$\begin{array}{l}q_t\end{array}$	$\begin{array}{l}\sigma\end{array}$
psi	bpd	(md·ft)/cp

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