Thermo-hydro-mechanical coupled mathematical model for controlling the pre-mining coal seam gas extraction with slotted boreholes

Drainage influence radius is the basic parameter for borehole arrangement, while the effect of high pressure water jet slotting technology on borehole drainage influence radius has not been studied systematically. In this paper, a fully thermo-hydro-mechanical （THM） coupled model which represents th...

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Bibliographic Details
Published inInternational journal of mining science and technology Vol. 27; no. 3; pp. 473 - 479
Main Authors Xue, Yi, Gao, Feng, Gao, Yanan, Liang, Xin, Zhang, Zhizhen, Xing, Yan
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2017
State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining&Technology, Xuzhou 221116, China
School of Mechanics&Civil Engineering, China University of Mining&Technology, Xuzhou 221116, China%Rock Mass Modeling and Computational Rock Mechanics Laboratories, University of Arizona, Tucson, AZ 85721, USA
Elsevier
Subjects
Coal seam gas
Gas extraction
Slotted boreholes
Thermo-hydro-mechanical model
仿真结果
影响半径
排水系统
控制
煤层气开采
瓦斯压力
耦合数学模型
预钻孔
Thermo-hydro-mechanical model
Gas extraction
Slotted boreholes
Coal seam gas
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Summary:Drainage influence radius is the basic parameter for borehole arrangement, while the effect of high pressure water jet slotting technology on borehole drainage influence radius has not been studied systematically. In this paper, a fully thermo-hydro-mechanical （THM） coupled model which represents the non-linear responses of gas extraction was implemented to demonstrate the reliability of this model through history data matching. Based on this model, the susceptibilities of gas extraction with single slotted borehole, including the permeability, the gas pressure, the temperature, the coal adsorption characteristics and the radius of slot, were quantified through a series of simulations. The simulation results revealed that increasing the permeability, initial gas pressure and temperature could develop the influence radius of single slotted borehole, This finite element model and its simulation results can improve the understanding of the coal-gas interactions of underground gas drainage and provide a scientific basis for the optimization of drainage systems,
Bibliography:Coal seam gasGas extractionThermo-hydro-mechanical modelSlotted boreholes
Drainage influence radius is the basic parameter for borehole arrangement, while the effect of high pressure water jet slotting technology on borehole drainage influence radius has not been studied systematically. In this paper, a fully thermo-hydro-mechanical （THM） coupled model which represents the non-linear responses of gas extraction was implemented to demonstrate the reliability of this model through history data matching. Based on this model, the susceptibilities of gas extraction with single slotted borehole, including the permeability, the gas pressure, the temperature, the coal adsorption characteristics and the radius of slot, were quantified through a series of simulations. The simulation results revealed that increasing the permeability, initial gas pressure and temperature could develop the influence radius of single slotted borehole, This finite element model and its simulation results can improve the understanding of the coal-gas interactions of underground gas drainage and provide a scientific basis for the optimization of drainage systems
32-1827/TD
ISSN:2095-2686
DOI:10.1016/j.ijmst.2017.03.012