Sandface pressure response drop to the constant unit-rate production $\begin{array}{l}q(t)=1\end{array}$ :

(1)	$\begin{array}{l}\displaystyle p_u(t) = p_{\rm wf}(0) - p_{\rm wf}(t)\|_{q = 1} >0, \quad p_{u}(0) = 0\end{array}$

Sandface pressure response drop in well "m" to the constant unit-rate production $\begin{array}{l}q_m=1\end{array}$ from the same well "m":

(2)	$\begin{array}{l}\displaystyle p_{u,mm}(t) = p_{{\rm wf}, mm}(0) -p_{{\rm wf}, mm}(t)\|_{q_m = 1} >0, \quad p_{u,mk}(0) = 0\end{array}$

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

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