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A cross-well type of Unit-rate Transient Response (UTR):  Sandface pressure response drop in well "m" to unit-rate (q_k=1) production from the well "k":

(1) p_{u,mk}(t) = p_{{\rm wf}, m}(0) - p_{{\rm wf}, mk}(t)|_{q_m =1} > 0, \quad p_{u,mk}(0) = 0

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 q_m=1 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

See Also

Petroleum Industry / Upstream / Subsurface E&P Disciplines / Well Testing / Pressure Testing / Unit-rate transient response (UTR)

Drawdown Transient Response (DTR) ]

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