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A Case Study on the Fracturing Radius and Time Effects of CO 2 Phase Transition Fracturing in Coal Seams

Author

Listed:
  • Hong Yin

    (Engineering Research Center for Waste Oil Recovery Technology and Equipment of Ministry of Education, Chongqing Technology and Business University, Chongqing 400067, China
    State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266580, China)

  • Yuan Deng

    (Engineering Research Center for Waste Oil Recovery Technology and Equipment of Ministry of Education, Chongqing Technology and Business University, Chongqing 400067, China)

  • Chao Liu

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Yafei Chen

    (Engineering Research Center for Waste Oil Recovery Technology and Equipment of Ministry of Education, Chongqing Technology and Business University, Chongqing 400067, China
    State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266580, China)

  • Ziqiang Chen

    (Engineering Research Center for Waste Oil Recovery Technology and Equipment of Ministry of Education, Chongqing Technology and Business University, Chongqing 400067, China)

  • Chao Qin

    (Key Laboratory of Karst Georesources and Environment, College of Resources and Environmental Engineering, Ministry of Education, Guizhou University, Guiyang 550025, China)

  • Donglin He

    (Engineering Research Center for Waste Oil Recovery Technology and Equipment of Ministry of Education, Chongqing Technology and Business University, Chongqing 400067, China
    State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266580, China)

Abstract

CO 2 phase transition fracturing (CPTF) is considered to be a promising way to improve the recovery efficiency of coalbed methane in deep, tight coal seams. In addition, it is significant to the CO 2 -ECBM and CO 2 storage in coal. To better understand the fracturing radius and time effects of CPTF, a field experimentation was conducted on the Ji-15 coal seam of Pingmei 8th Coal Mine. The results indicate that the fracturing radius and time effects are significantly related; with the increase in fracturing radius, the time for extraction rate to reach the peak value is shorter. The calculated value of effective fracturing radius is 7.56 m via the fitting relationship. According to the CO 2 content in different extraction boreholes after fracturing, it can be concluded that the crack zone is 5 m. In addition, the extraction rate of methane firstly increases slowly for a while, and then reaches the peak. This work could provide theoretical directions for the arrangement of fracturing and extraction boreholes in CO 2 fracturing works related to CO 2 -ECBM and gas pre-extraction in coal mining.

Suggested Citation

  • Hong Yin & Yuan Deng & Chao Liu & Yafei Chen & Ziqiang Chen & Chao Qin & Donglin He, 2022. "A Case Study on the Fracturing Radius and Time Effects of CO 2 Phase Transition Fracturing in Coal Seams," Sustainability, MDPI, vol. 14(7), pages 1-9, April.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:7:p:4260-:d:786499
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