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Transient Flow of a Horizontal Well with Multiple Fracture Wings in Coalbed Methane Reservoirs

Author

Listed:
  • Qing Tian

    (School of Petrochemical and Energy, Zhejiang Ocean University, Zhoushan 316022, China)

  • Yudong Cui

    (School of Energy Resources, China University of Geosciences, Beijing 100083, China)

  • Wanjing Luo

    (School of Energy Resources, China University of Geosciences, Beijing 100083, China)

  • Pengcheng Liu

    (School of Energy Resources, China University of Geosciences, Beijing 100083, China)

  • Bo Ning

    (Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China)

Abstract

Horizontal wells with multi-stage fractures have been widely used to improve coalbed methane (CBM) production from coalbed methane reservoirs. The main focus of this work is to establish a new semi-analytical method in the Laplace domain and investigate the transient pressure behavior in coalbed methane reservoirs. With the new semi-analytical method, flow regimes of a multi-fractured horizontal well in coalbed methane reservoirs were identified. In addition, the sensitivities of fracture conductivity, diffusion model, storability ratio, inter-porosity flow coefficient, adsorption index, fracture spacing, fracture asymmetry, non-planar angle, and wellbore storage were studied. Results indicate that six characteristic flow regimes can be identified for multi-fractured horizontal wells in coalbed methane reservoirs, which are bilinear flow, first linear flow, desorption-diffusion flow, first pseudo-radial flow, second linear flow, and second pseudo-radial flow. Furthermore, the sensitivity analysis shows that the early flow is mainly determined by the fracture conductivity, the asymmetry factor, the non-planar angle, and the wellbore storage; while the desorption-diffusion flow regime is mainly influenced by the diffusion model, the storability ratio, the inter-porosity flow coefficient, the adsorption index, and the fracture spacing. Our work can provide a deep insight into the fluid flow mechanism of multi-fractured horizontal wells in coalbed methane reservoirs.

Suggested Citation

  • Qing Tian & Yudong Cui & Wanjing Luo & Pengcheng Liu & Bo Ning, 2020. "Transient Flow of a Horizontal Well with Multiple Fracture Wings in Coalbed Methane Reservoirs," Energies, MDPI, vol. 13(6), pages 1-20, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:6:p:1498-:d:335528
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    References listed on IDEAS

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    1. Guoqiang Xing & Shuhong Wu & Jiahang Wang & Mingxian Wang & Baohua Wang & Jinjian Cao, 2019. "Pressure Transient Performance for a Horizontal Well Intercepted by Multiple Reorientation Fractures in a Tight Reservoir," Energies, MDPI, vol. 12(22), pages 1-23, November.
    2. Mingxian Wang & Guoqiang Xing & Zifei Fan & Wenqi Zhao & Lun Zhao & Heng Song, 2018. "A Novel Model Incorporating Geomechanics for a Horizontal Well in a Naturally Fractured Reservoir," Energies, MDPI, vol. 11(10), pages 1-28, September.
    3. Guoqiang Xing & Mingxian Wang & Shuhong Wu & Hua Li & Jiangyan Dong & Wenqi Zhao, 2019. "Pseudo-Steady-State Parameters for a Well Penetrated by a Fracture with an Azimuth Angle in an Anisotropic Reservoir," Energies, MDPI, vol. 12(12), pages 1-27, June.
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    Cited by:

    1. Suyang Zhu & Alireza Salmachi, 2021. "Flowing Material Balance and Rate-Transient Analysis of Horizontal Wells in Under-Saturated Coal Seam Gas Reservoirs: A Case Study from the Qinshui Basin, China," Energies, MDPI, vol. 14(16), pages 1-24, August.

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