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transient drainage radius

1. n. [Well Testing]

The calculated maximum radius in a formation in which pressure has been affected during the flow period of a transient well test. While not absolutely accurate, the value has meaning in relation to the total volume of reservoir that is represented by calculated reservoir parameters, such as kh, the permeability thickness. This may also be termed radius of investigation.

Synonyms: radius of investigation

See: permeability thickness