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# Drawdown Transient Response = DTR

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( also called  unit-rate self-response )

Sandface pressure response drop to the constant unit-rate production $//$:

 (1)

Sandface pressure response drop  in well "m" to the constant unit-rate production $//$ from the same well "m":

 (2)

 Fig. 1. A sample of typical DTR (pressure drop P in blue and log-derivative P' in red) presented on PTA type-library log-log plot