Transient pressure behaviour of multi-stage fractured horizontal well in stress-sensitive coal seam
by Ren Zongxiao; Qu Zhan; Jiang Huayi; Lou Erbiao; Zhang Jiaming; Yao Ze; Yang Hongbin
International Journal of Oil, Gas and Coal Technology (IJOGCT), Vol. 22, No. 2, 2019

Abstract: As an alternative energy of conventional resources, coalbed methane (CBM) has been studied globally. So far, the pressure distribution model for multi-stage fractured horizontal well (MFW) in stress sensitive coal seam is almost solved by numerical method. In this paper, a transient pressure behaviour model of MFW was established. Using perturbation transformation, Laplace transform, image theory and superposition principle the mathematical model was solved. According to the result of calculation, the flow process of MFW can be identified as six regimes. Stress-sensibility primarily influences the latter five stages. The well bore dimensionless pressure drop is several times larger comparing with the situation that does not take the stress sensitive into account. Accordingly, the influences of some of the critical parameters on the transient pressure behaviour were studied, including the fracture number, permeability modulus, storage ratio, and so on. [Received: August 25, 2016; Accepted: October 9, 2017]

Online publication date: Mon, 07-Oct-2019

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