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The Influence of the Injected Water on the Underground Coalbed Methane Extraction

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  • Yanbao Liu

    (Gas Research Branch, Chongqing Research Institute of China Coal Technology and Engineering Group Crop., Chongqing 400037, China
    National Key Laboratory of Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing 400037, China)

  • Zhigang Zhang

    (Gas Research Branch, Chongqing Research Institute of China Coal Technology and Engineering Group Crop., Chongqing 400037, China
    National Key Laboratory of Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing 400037, China)

  • Wei Xiong

    (Gas Research Branch, Chongqing Research Institute of China Coal Technology and Engineering Group Crop., Chongqing 400037, China
    National Key Laboratory of Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing 400037, China)

  • Kai Shen

    (Gas Research Branch, Chongqing Research Institute of China Coal Technology and Engineering Group Crop., Chongqing 400037, China
    National Key Laboratory of Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing 400037, China)

  • Quanbin Ba

    (Gas Research Branch, Chongqing Research Institute of China Coal Technology and Engineering Group Crop., Chongqing 400037, China
    National Key Laboratory of Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing 400037, China)

Abstract

The increasing demand on coal production has led to the gradually increase of mining depth and more high methane mines, which bring difficulties in terms of coalbed methane (CBM) extraction. Hydraulic fracturing is widely applied to improve the production of CBM, control mine gas, and prevent gas outbursts. It improves coal bed permeability and accelerate desorption and migration of CBM. Even though the impacts of hydraulic fracturing treatment on the coal reservoirs are rare, negative effects could not be totally ignored. To defend this defect, the presented work aims to study the influence of water filtration on coal body deformation and permeability evolution. For this purpose, a simulation based finite element method was developed to build a solid-fluid coupled two-phase flow model using commercial software (COMSOL Multiphysics 5.4). The model was verified using production data from a long strike borehole from Wangpo coal mine in Shanxi Province, China. Several simulation scenarios were designed to investigate the adverse impacts of hydraulic fracturing on gas flow behaviors. The mechanisms of both relative and intrinsic permeability evolutions were analyzed, and simulation results were presented. Results show that the intrinsic permeability of the fracture system increases in the water injection process. The impacts of water imitation were addressed that a critical time was observed beyond which water cannot go further and also a critical pressure exists above which the hydraulic pressure would impair the gas flow. Sensitivity analysis also showed that a suitable time and pressure combination could be observed to maximize gas extraction. This work provides an efficient approach to guide the coal bed methane exploitation and other unconventional gas reservoirs.

Suggested Citation

  • Yanbao Liu & Zhigang Zhang & Wei Xiong & Kai Shen & Quanbin Ba, 2020. "The Influence of the Injected Water on the Underground Coalbed Methane Extraction," Energies, MDPI, vol. 13(5), pages 1-16, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:5:p:1151-:d:328028
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    References listed on IDEAS

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    1. Liang Cheng & Zhaolong Ge & Binwei Xia & Qian Li & Jiren Tang & Yugang Cheng & Shaojie Zuo, 2018. "Research on Hydraulic Technology for Seam Permeability Enhancement in Underground Coal Mines in China," Energies, MDPI, vol. 11(2), pages 1-19, February.
    2. Shangxian Yin & Jincai Zhang & Demin Liu, 2015. "A study of mine water inrushes by measurements of in situ stress and rock failures," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 79(3), pages 1961-1979, December.
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    Cited by:

    1. Kejiang Lei & Dandan Qiu & Shilong Zhang & Zichao Wang & Yan Jin, 2023. "Coal Mine Fire Emergency Rescue Capability Assessment and Emergency Disposal Research," Sustainability, MDPI, vol. 15(11), pages 1-19, May.

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