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Table 1

Boundary flow response behavior of Figure 3.

Symbol description Closed & infinite, r eD [Θ] & r eD [∞] Const-pressure & infinite, r eD [Ω] & r eD [∞]
Model sketch
Identifiable window
Response behavior ①Wellbore storage: unit slope ①Wellbore storage: unit slope
②Skin transition flow ②Skin transition flow
③IARF: const derivative 0.5 ③IARF: const derivative 0.5
④CBF: unit slop ④CpBF: const slope (−2.5 is its limit)
⑤CpBF ⑤Pseudo-CpBF: const slope m = [Ω]
⑥Pseudo-IARF: const derivative l = l 0/κ[∞]

Where κ[∞] is the permeability ratio of infinite layer, l 0 is the pressure derivative value when the κ[Ω] = 1, a is the coefficient.

Notes: “IARF” is Infinite-Acting Radial Flow, “CBF” is Closed Boundary Flow, “CpBF” is the Const-Pressure Boundary flow.

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