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Research on the pressure variation law and enhancing CBM extraction application effect of CO2 phase transition jet coal seam fracturing technology

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Abstract

Due to the limited permeability and high methane content of the majority of China’s coal seams, significant coal mining gas disasters frequently occur. There is an urgent need to artificially improve the permeability of coalbed methane (CBM) reservoirs, enhance the recovery efficiency of CBM and prevent mine gas accidents. As a novel coal rock fracture technology, the CO2 phase transition jet (CPTJ) has been widely used due to its advantages of safety and high fragmentation efficiency. In this study, to ascertain the effects of the pressure of CPTJ fracturing, the influence of its jet pressure on cracked coal rock was revealed, and its effect on CBM extraction was clarified. In this research, the law of CPTJ pressure decay with time was investigated using experimental and theoretical methods. Based on the results, the displacement and discrete fracture network law of CPTJ fracturing coal rock under different jet pressure conditions were studied using particle flow code numerical simulation. Finally, field experiments were conducted at the Shamushu coal mine to assess the efficiency of CPTJ in enhancing CBM drainage. The results showed that the pressure of the CPTJ decreased exponentially with time and significantly influenced the number and expansion size of cracks that broke coal rock but not their direction of development. CPTJ technology can effectively increase the number of connected microscopic pores and fractures in CBM reservoirs, strongly increase the CBM drainage flow rate by between 5.2 and 9.8 times, and significantly reduce the CBM drainage decay coefficient by between 73.58% and 88.24%.

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Acknowledgments

This research was partially supported by the National Natural Science Foundation of China (Grant Nos. 52204095, 51974163, 52274127 and 52174174), the National Key Research and Development Program of China (No. 2021YFC2902104), the Natural Science Foundation of Hunan Province, China (No. 2023JJ30509), the Key Laboratory of Safety and High-efficiency Coal Mining of Ministry of Education (No. JYBSYS2020204), the Special Program for Basic Research of Key Scientific Research Projects of Colleges and Universities in Henan Province of China (No. 21ZX004), and the Innovative Scientific Research Team of Henan Polytechnic University in China (No. T2022-1).

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Authors and Affiliations

  1. School of Resources Environment and Safety Engineering, University of South China, Hengyang, 421001, China

    Xin Bai, Zhuoli Zhou & Guicheng He

  2. State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo, 454000, China

    Xin Bai & Dengke Wang

  3. Key Laboratory of Safety and High-efficiency Coal Mining (Ministry of Education), Anhui University of Science and Technology, Huainan, 232001, China

    Xin Bai

  4. School of Resources and Safety Engineering, Chongqing University, Chongqing, 400044, China

    Dongming Zhang & Han Yang

  5. China Coal Technology Engineering Group Chongqing Research Institute, Chongqing, 400037, China

    Zenrui Fan

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  1. Xin Bai
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Correspondence to Xin Bai or Guicheng He.

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Bai, X., Zhou, Z., He, G. et al. Research on the pressure variation law and enhancing CBM extraction application effect of CO2 phase transition jet coal seam fracturing technology. Front. Earth Sci. 17, 867–883 (2023). https://doi.org/10.1007/s11707-022-1078-y

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