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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.

homogeneous reservoir it can be estimated as:

(1) A_e = \frac{V_e}{h_e \ \phi_e}



drainage volume

h_e = \rm const

effective formation thickness

\phi_e = \rm const

effective porosity

It is often related to drainage radius  r_e as:

(2) A_e = \pi \, r_e^2

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

See also

Physics /  Fluid Dynamics / Percolation

Petroleum Industry / Upstream / Subsurface E&P Disciplines / Field Study & Modelling / Drainage (fluid flow)

[ Drainage volume Ve ] [ Drainage radius (re) ]

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