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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 For homogeneous reservoir it can be estimated as:
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A_e = \frac{V_e}{h_e \ \phi_e} |
where
| drainage volume | ||||
| effective formation thickness | ||||
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| effective porosity |
It is often related to drainage radius
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