A cross-well type of Unit-rate Transient Response (UTR): Sandface pressure response drop in well "m" to unit-rate ( $\begin{array}{l}q_k=1\end{array}$ ) production from the well "k":

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

It's a virtual analogue of a unit-rate step-response pressure interference test to the shut-in well "k" from the constant unit-rate production $\begin{array}{l}q_m=1\end{array}$ from the well "m"

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

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