A case study of promoting CH4 discharge and preventing coal & gas outburst accidents by using cross-layer liquid injection technology |
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| Institution: | 1. College of Safety Science and Engineering, Xi''an University of Science and Technology, Xi''an, 710054, China;2. State and Local Joint Engineering Laboratory of Methane Extraction in Complex Coal Gas Seam, Chongqing University, Chongqing, 400030, China;3. National Technical Center, China Railway 17th Bureau Group Co., Ltd, Taiyuan, 030000, China;1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui, 230026, China;2. Suzhou Key Laboratory of Urban Public Safety, Suzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou, Jiangsu, 215123, China;1. Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany;2. thuba AG, Basel, Switzerland;3. Otto-von-Guericke-Universität Magdeburg, Magdeburg, Germany;1. School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, China;2. State Key Laboratory of Coal Resources and Safety Mining, China University of Mining and Technology, Beijing, 100083, China;1. KU Leuven, Department of Mechanical Engineering, Group T Leuven Campus, A. Vesaliusstraat 13, B-3000, Leuven, Belgium;2. KU Leuven, Department of Materials Engineering, Group T Leuven Campus, A. Vesaliusstraat 13, B-3000, Leuven, Belgium;3. KU Leuven, Department of Chemical Engineering, Celestijnenlaan 200F, B-3001, Leuven, Belgium;4. KU Leuven, Department of Mechanical Engineering, Celestijnenlaan 300A, B-3001, Leuven, Belgium;5. Adinex NV, Brouwerijstraat 11, B-2200, Herentals, Belgium;6. North-West University, Material Science, Innovation and Modelling (MaSIM), Private Bag X2046, 2745, Mmabatho, South Africa;1. Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control, College of Safety Science and Engineering, Nanjing Tech University, Nanjing, 210009, China;2. School of Environment and Safety Engineering, Changzhou University, Changzhou, 213164, Jiangsu, China;3. School of Materials Engineering, Changshu Institute of Technology, Changshu, 215500, China;4. Department of Safety, Health, and Environmental Engineering, National Yunlin University of Science and Technology, 123, University Rd., Sec. 3, Douliou, Yunlin, 64002, Taiwan, ROC;5. BASF Corporation, 1609 Biddle Avenue, Wyandotte, MI, 48192, USA;1. College of Safety Science and Engineering, Nanjing Tech University, Nanjing, 211816, China;2. Department of Process Engineering & Applied Science, Dalhousie University, Halifax, B3H 4R2, Canada;3. Fire & Explosion Protection Laboratory, Northeastern University, Shenyang, 110819, China |
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| Abstract: | To solve the problem of gas extraction in coal bodies with the outburst risk, the cross-layer drilling fluid injection technology for protecting rock pillars is adopted to promote gas extraction. We combined theoretical calculations, laboratory experiments, and field tests to analyze the degree of fissure development in different parts of the coal body. We also determined the liquid injection parameters and negative extraction pressures. The CH4 extraction effects of three stages before, during, and after liquid injection was compared. The results show that the possibility of coal outbursts in different parts is reduced by 58%∼70% by using liquid injection and pumping technology. The peak value of CH4 pure flow in the main pipe is increased by 1.5–2.8 times, and the average value is increased by 1.8–2.6 times. The peak value of gas concentration at the orifice of the extraction hole is increased by 1.6–3.5 times, and the average value is increased by 1.6–4 times. Liquid injection to promote extraction greatly improves the gas extraction efficiency in coal bodies, which is of great significance to reducing cost, shortening the construction period, and ensuring safe production, and providing a reference for similar engineering construction. |
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| Keywords: | Low permeability Cross-layer liquid injection Different pressure pumping Displacement |
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