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Research into the Mechanism and Application of Liquid CO 2 Phase-Transition Fracturing in a Coal Seam to Enhance Permeability

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  • Feng Zhang

    (School of Mine and Coal, Inner Mongolia University of Science and Technology, Baotou 014010, China
    State Key Laboratory of Gas Disaster Monitoring and Emergency Technology, Chongqing 400037, China
    China Coal Technology and Engineering Group Chongqing Research Institute, Chongqing 400037, China)

Abstract

The geological structures of the coal fields in China are complex. With a continuous increase in the mining depth, the coal seams show the characteristics of high gas and low permeability, and the disaster potential for a coal and gas outburst intensifies in the process of coal mining. Gas drainage is one of the primary measures used to prevent and control gas disasters. Effectively improving the permeability of a coal seam requires urgent attention. Currently, the method of loose blasting is used in engineering to enhance the permeability of coal seams. However, the technology of loose blasting easily leads to the poor development of coal fractures or the severe crushing of coal, which will affect the gas drainage. Thus, this paper studied the technology of liquid CO 2 phase-transition fracturing in a coal seam. COMSOL was used to determine the influence radius of the liquid carbon-dioxide phase-transition cracking, which was 13.4 m, and to design the scheme of the borehole. The field test was carried out in the 81,506th working face of the Baode Coal Mine. From the onsite-monitoring data, the results showed that the drainage effect increased by 293.9%, the gas-drainage concentration increased by 242.4%, the permeability coefficient of the coal seam increased by 3–7.75 times, and the permeability enhancement effect was good.

Suggested Citation

  • Feng Zhang, 2023. "Research into the Mechanism and Application of Liquid CO 2 Phase-Transition Fracturing in a Coal Seam to Enhance Permeability," Sustainability, MDPI, vol. 15(4), pages 1-11, February.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:4:p:3308-:d:1065019
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    References listed on IDEAS

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    1. Qingdong Qu & Jingyu Shi & Andy Wilkins, 2022. "A Numerical Evaluation of Coal Seam Permeability Derived from Borehole Gas Flow Rate," Energies, MDPI, vol. 15(10), pages 1-13, May.
    2. Jieqin Xia & Bin Dou & Hong Tian & Jun Zheng & Guodong Cui & Muhammad Kashif, 2021. "Research on Initiation of Carbon Dioxide Fracturing Pipe Using the Liquid Carbon Dioxide Phase-Transition Blasting Technology," Energies, MDPI, vol. 14(3), pages 1-16, January.
    3. Yonglong Wang & Zaijiang Yu & Zhenfeng Wang, 2018. "A Mechanical Model of Gas Drainage Borehole Clogging under Confining Pressure and Its Application," Energies, MDPI, vol. 11(10), pages 1-16, October.
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