Numerical simulation of seepage field of gas extraction drilling of single bedding of mining-coal bed |
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| Authors: | JIANG Jiji WANG Hongtu WANG Zai-qing HU Guo-zhong and YUAN Zhi-gang |
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| Institution: | State and Local Joint Engineering laboratory of Methane Drainage in Complex Coal Gas Seam,Key Laboratory for Exploitation of China Southwestern Resources & Environmental DisasterControl Engineering, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China;State and Local Joint Engineering laboratory of Methane Drainage in Complex Coal Gas Seam,Key Laboratory for Exploitation of China Southwestern Resources & Environmental DisasterControl Engineering, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China;Chongqing Institute of Geology and Mineral Resources, Chongqing 400042,P.R. China;Key Laboratory for Exploitation of China Southwestern Resources & Environmental DisasterControl Engineering, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China;School of Mines,China University of Mining and Technology,Xuzhou 221116,Jiangsu,P.R. China;State and Local Joint Engineering laboratory of Methane Drainage in Complex Coal Gas Seam,Key Laboratory for Exploitation of China Southwestern Resources & Environmental DisasterControl Engineering, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China |
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| Abstract: | Aiming at the problem of reasonable decorate of coal gas extraction drilling, combining with the initial and boundary condition of borehole extraction, the solid and gas coupling mathematical model of gas seepage of borehole extraction is deduced based on established control equations of seepage field and deformation field. Taking gas extraction of stone coal slit as an example, according to the characteristics of coal seam in the research, the numerical simulation method is used to obtain the distribution rule of gas pressure, coalbed gas permeability, and coalbed gas seepage velocity as well as seam deformation. The effective radius of gas extraction drilling of single bedding about mining-coal bed is determined, which provides the basis for optimum arrangement of gas extraction drilling of single bedding. The results show that the effective radius of stone coal is about 4 m. If the prolonging drilling drainage time is less than 20%, the drilling quantities would reduce by about 50%. |
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| Keywords: | mining engineering gas extraction seepage field |
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