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A Thermo-Hydro-Mechanical-Chemical Coupling Model and Its Application in Acid Fracturing Enhanced Coalbed Methane Recovery Simulation

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  • Chaojun Fan

    (College of Mining, Liaoning Technical University, Fuxin 123000, China
    Center of Technology, Shanxi Lu’an Mining (Group) Limited Liability Company, Changzhi 046299, China
    State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454003, China)

  • Mingkun Luo

    (College of Mining, Liaoning Technical University, Fuxin 123000, China
    Center of Technology, Shanxi Lu’an Mining (Group) Limited Liability Company, Changzhi 046299, China)

  • Sheng Li

    (College of Mining, Liaoning Technical University, Fuxin 123000, China)

  • Haohao Zhang

    (College of Mining, Liaoning Technical University, Fuxin 123000, China)

  • Zhenhua Yang

    (College of Mining, Liaoning Technical University, Fuxin 123000, China)

  • Zheng Liu

    (College of Mining, Liaoning Technical University, Fuxin 123000, China)

Abstract

The reservoir permeability dominates the transport of gas and water in coal seam. However, coal seams rich in gas usually contain various pores and fractures blocked by a large amount of minerals, which leads to an ultra-low permeability and gas extraction rate, and thus an increase of drilling workload. We first propose a thermo-hydro-mechanical-chemical coupled model (THMC) for the acid fracturing enhanced coalbed methane recovery (AF-ECBM). Then, this model is applied to simulate the variation of key parameters during AF-ECBM using a 2D geometry. The effect of different extraction schedules are comparatively analyzed to give an insight into these complex coupling responses in coal seam. Result confirms that the AF-ECBM is an effective way to increase the reservoir permeability and improve the gas production using the proposed model. The range of permeability increment zone increases most dramatically in the way of acid fracturing, followed by none-acid fracturing and acidizing over time. The gas production in order is: acid fracturing (AF-ECBM) > fracturing (F-ECBM) > acidification (A-ECBM)> direct extraction (D-CBM).

Suggested Citation

  • Chaojun Fan & Mingkun Luo & Sheng Li & Haohao Zhang & Zhenhua Yang & Zheng Liu, 2019. "A Thermo-Hydro-Mechanical-Chemical Coupling Model and Its Application in Acid Fracturing Enhanced Coalbed Methane Recovery Simulation," Energies, MDPI, vol. 12(4), pages 1-20, February.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:4:p:626-:d:206314
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    References listed on IDEAS

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    1. Cai-Ping Lu & Lin-Ming Dou & Nong Zhang & Jun-Hua Xue & Guang-Jian Liu, 2014. "Microseismic and acoustic emission effect on gas outburst hazard triggered by shock wave: a case study," 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. 73(3), pages 1715-1731, September.
    2. Bo Zhao & Guangcai Wen & Haitao Sun & Xusheng Zhao, 2018. "Experimental Study of the Pore Structure and Permeability of Coal by Acidizing," Energies, MDPI, vol. 11(5), pages 1-15, May.
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    Cited by:

    1. Chao Xu & Haoshi Sun & Kai Wang & Liangliang Qin & Chaofei Guo & Zhijie Wen, 2021. "Effect of low‐level roadway tunneling on gas drainage for underlying coal seam mining: Numerical analysis and field application," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 11(4), pages 780-794, August.
    2. Fang, Huihuang & Li, Ang & Sang, Shuxun & Gu, Chengchuan & Yang, Jing & Li, Lei & Liu, Huihu & Xu, Hongjie & Huang, Yanhui, 2023. "Numerical analysis of permeability rebound and recovery evolution with THM multi-physical field models during CBM extraction in crushed soft coal with low permeability and its indicative significance ," Energy, Elsevier, vol. 262(PA).
    3. Xin Li & Jie Zhang & Rongxin Li & Qi Qi & Yundong Zheng & Cuinan Li & Ben Li & Changjun Wu & Tianyu Hong & Yao Wang & Xiaoxiao Du & Zaipeng Zhao & Xu Liu, 2021. "Numerical Simulation Research on Improvement Effect of Ultrasonic Waves on Seepage Characteristics of Coalbed Methane Reservoir," Energies, MDPI, vol. 14(15), pages 1-15, July.

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