Sandface pressure response  in well "m" to the constant unit-rate () production 


In multi-well deconvolution applications the above definition should be clarified as: 


DTR is a sandface pressure response  in well "m" to the constant unit-rate () production from the same well "m"


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