The area around a producing or injecting well where reservoir fluid is forced moving by the well operation.

In other words, the area, where reservoir fluid is moving along the streamlines which either stem from injecting well or end up at producing well.

For a constant-thickness reservoir it can be estimated as:

(1)	$\begin{array}{l}\displaystyle A_e = \frac{V_e}{h}\end{array}$

where

$\begin{array}{l}h = \rm const\end{array}$	effective formation thickness
$\begin{array}{l}V_e\end{array}$	drainage volume

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See also