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

Author

Listed:
  • Zuhao Kou

    (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
    Department of Chemical Engineering, College of Engineering and Applied Science, University of Wyoming, 1000 E. University Avenue, Laramie, WY 82071-2000, USA)

  • Haitao Wang

    (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China)

Abstract

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.

Suggested Citation

  • Zuhao Kou & Haitao Wang, 2020. "Transient Pressure Analysis of a Multiple Fractured Well in a Stress-Sensitive Coal Seam Gas Reservoir," Energies, MDPI, vol. 13(15), pages 1-20, July.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:15:p:3849-:d:390816
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    Citations

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    Cited by:

    1. Kou, Zuhao & Wang, Tongtong & Chen, Zhuoting & Jiang, Jincheng, 2021. "A fast and reliable methodology to evaluate maximum CO2 storage capacity of depleted coal seams: A case study," Energy, Elsevier, vol. 231(C).
    2. Jiehao Duan & Changjun Li & Jin Jin, 2022. "Modal Analysis of Tubing Considering the Effect of Fluid–Structure Interaction," Energies, MDPI, vol. 15(2), pages 1-16, January.

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