Total open pore volume around the well where reservoir flow is initiated by production or injection from a given well or group of wells.

There are three major types of the drainage volumes:

Dynamic drainage volume of a well	which is formed dynamically depending on the nearby well production and injection
Potential drainage volume of a well	which can be formed in case a given well is working alone on the whole field (no interference with other wells)
Jointly drained volume of a group of wells	which is formed dynamically by production and injection of all wells

For homogeneous reservoir it can be estimated as:

(1)	$\begin{array}{l}\displaystyle V_e = A_e \, h_e \, \phi_e\end{array}$

where

$\begin{array}{l}h = \rm const\end{array}$	effective formation thickness
$\begin{array}{l}\phi_e = \rm const\end{array}$	effective porosity
$\begin{array}{l}A_e\end{array}$	drainage area

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See also