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Drainage area (Ae)

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
homogeneous reservoir it can be estimated as:

 (1)

where

 $//$ drainage volume $//$ effective formation thickness $//$ effective porosity

It is often related to drainage radius $//$ as:

 (2)

which can be is misnomer for other shapes of drainage area.