Effect of liquid carbon dioxide phase change fracturing technology on gas drainage |
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| Authors: | Hai-dong Chen Zhao-feng Wang Ling-ling Qi Feng-hua An |
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| Institution: | 1.MOE Engineering Center of Mine Disaster Prevention and Rescue,Henan Polytechnic University,Jiaozuo,People’s Republic of China;2.State Key Laboratory Cultivation Base for Gas Geology and Gas Control,Henan Polytechnic University,Jiaozuo,People’s Republic of China;3.Collaborative Innovation Center of Coal Safety Production of Henan Province,Jiaozuo,People’s Republic of China |
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| Abstract: | Coal mine researchers have been studying the subject of improving the effect of gas drainage to control gas accident. This paper focuses on a new permeability-improvement technology, liquid carbon dioxide phase change fracturing technology. This technology can be classified as physical blasting by using the phase energy of liquid carbon dioxide in the drilling underground coal mine. According to the results of field tests, by applying the liquid carbon dioxide phase change fracturing technology, the radius of the damaged area in the coal body around the drilling reached 5 m. Also, compared with the original coal body, the permeability of the damaged area increased approximately six times. In addition, based on the permeability of the damaged area, the influence of the liquid carbon dioxide phase change fracturing technology on the gas drainage radius was analyzed by numerical calculation. It can be observed from the numerical results that the effect of gas drainage was improved greatly by the liquid carbon dioxide phase change fracturing operation. Research results of this paper can contribute to safe and efficient mining of coal mines. |
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