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 [∞] |
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Model sketch |
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Identifiable window |
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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 = aκ[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.