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Transient Pressure Analysis of a Multiple Fractured Well in a Stress-Sensitive Coal Seam Gas Reservoir

by 1,2,* and 1,*
1
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
2
Department of Chemical Engineering, College of Engineering and Applied Science, University of Wyoming, 1000 E. University Avenue, Laramie, WY 82071-2000, USA
*
Authors to whom correspondence should be addressed.
Energies 2020, 13(15), 3849; https://doi.org/10.3390/en13153849
Received: 18 April 2020 / Revised: 15 July 2020 / Accepted: 24 July 2020 / Published: 28 July 2020
(This article belongs to the Section K: Energy Sources)
This paper investigates the bottom-hole pressure (BHP) performance of a fractured well with multiple radial fracture wings in a coalbed methane (CBM) reservoir with consideration of stress sensitivity. The fluid flow in the matrix simultaneously considers adsorption–desorption and diffusion, whereas fluid flow in the natural fracture system and the induced fracture network obeys Darcy’s law. The continuous line-source function in the CBM reservoir associated with the discretization method is employed in the Laplace domain. With the aid of Stehfest numerical inversion technology and Gauss elimination, the transient BHP responses are determined and analyzed. It is found that the main flow regimes for the proposed model in the CBM reservoir are as follows: linear flow between adjacent radial fracture wings, pseudo-radial flow in the inner region or Stimulated Reservoir Volume (SRV), and radial flow in outer region (un-stimulated region). The effects of permeability modulus, radius of SRV, ratio of permeability in SRV to that in un-stimulated region, properties of radial fracture wings, storativity ratio of the un-stimulated region, inter-porosity flow parameter, and adsorption–desorption constant on the transient BHP responses are discussed. The results obtained in this study will be of great significance for the quantitative analyzing of the transient performances of the wells with multiple radial fractures in CBM reservoirs. View Full-Text
Keywords: coalbed methane; multiple transportation mechanisms; multi-wing fractured well; stress sensitivity; stimulated reservoir volume coalbed methane; multiple transportation mechanisms; multi-wing fractured well; stress sensitivity; stimulated reservoir volume
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MDPI and ACS Style

Kou, Z.; Wang, H. Transient Pressure Analysis of a Multiple Fractured Well in a Stress-Sensitive Coal Seam Gas Reservoir. Energies 2020, 13, 3849. https://doi.org/10.3390/en13153849

AMA Style

Kou Z, Wang H. Transient Pressure Analysis of a Multiple Fractured Well in a Stress-Sensitive Coal Seam Gas Reservoir. Energies. 2020; 13(15):3849. https://doi.org/10.3390/en13153849

Chicago/Turabian Style

Kou, Zuhao, and Haitao Wang. 2020. "Transient Pressure Analysis of a Multiple Fractured Well in a Stress-Sensitive Coal Seam Gas Reservoir" Energies 13, no. 15: 3849. https://doi.org/10.3390/en13153849

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