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

Hong Yin, Yuan Deng, Chao Liu, Yafei Chen, Ziqiang Chen, Chao Qin and Donglin He
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Hong Yin: Engineering Research Center for Waste Oil Recovery Technology and Equipment of Ministry of Education, Chongqing Technology and Business University, Chongqing 400067, 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
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

Sustainability, 2022, vol. 14, issue 7, 1-9

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.

Keywords: carbon dioxide; phase transition fracturing; fracturing radius; time effects (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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