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 = 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.