Coupling mechanism of THM fields and SLG phases during the gas extraction process and its application in numerical analysis of gas occurrence regularity and effective extraction radius  

作　　者：Hui-Huang Fang Chun-Shan Zheng Ning Qi Hong-Jie Xu Hui-Hu Liu Yan-Hui Huang Qiang Wei Xiao-Wei Hou Lei Li Shuai-Liang Song 

机构地区：[1]State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University of Science and Technology,Huainan,Anhui 232001,China [2]Institute of Energy,Hefei Comprehensive National Science Center,Hefei,Anhui 230000,China [3]School of Earth and Environment,Anhui University of Science and Technology,Huainan,Anhui 232001,China [4]Great Institute of Standardization,China National Institute of Standardization's High Quality and Green Development Innovation R&D Base,Jinan,Shandong 250101,China [5]State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing,102249,China [6]School of Resources and Civil Engineering,Suzhou University,Suzhou,Jiangsu 234000,China [7]School of Resources and Environmental Engineering,Hefei University of Technology,Hefei,Anhui 230009,China [8]The Third Exploration Team of Shandong Coalfield Geologic Bureau,Taian,Shandong 250102,China [9]Shandong Provincial Lunan Geo-engineering Exploration Instituts,Jining,Shandong 272100,China

出　　处：《Petroleum Science》2022年第3期990-1006,共17页石油科学（英文版）

基　　金：financially supported by the University Synergy Innovation Program of Anhui Province(No.GXXT-2021-018);the National Natural Science Foundation of China(No.42102217);the Natural Science Research Project of Anhui University(Nos.KJ2020A0315,KJ2020A0317);the Institute of Energy,Hefei Comprehensive National Science Center(No.21KZS218);the Natural Science Foundation of Anhui Province(No.2108085MD134);the Foundation of State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing(No.PRP/open-2005)

摘　　要：The analysis of the coupling mechanism of thermal-hydraulic-mechanical(THM)fields,and solid-liquidgas(SLG)phases during gas extraction process is of profound significance to explore its numerical application in the gas occurrence regularity and its effective extraction radius.In this study,the Hudi coal mine in Qinshui basin is taken as the research area,the influencing factors of gas occurrence were analyzed,the differences in overburden load for gas pressure distribution and the factors influencing the effective extraction radius were further discussed by using the COMSOL software.The results show that the derivation of mathematical model in gas extraction shows that the process is a process the THM fields restrict each other,and the SLG phases influence each other.The longer the extraction time,the larger the influencing range of borehole,and the better the extraction effect.The larger the diameter of borehole,the larger the effective extraction radius,and the influence on gas extraction effect is smaller in the early stage and larger in the late stage.The borehole arrangement should be flexibly arranged according to the actual extraction situation.The higher the porosity,the higher the permeability,the better the gas extraction effect.The larger the overburden load of reservoir,the stronger the effective stress,which will result in the more severe the strain,and the closure of pore and fracture,which in turn will lead to the decrease of permeability and slow down the gas extraction.The relationship among extraction time,borehole diameter,negative pressure of gas extraction,permeability with effective extraction radius is exponential.This study has important theoretical and practical significance for clarifying and summarizing the gas occurrence regularity and its engineering practice.

关 键 词：Gas occurrence regularity Effective extraction radius THM fields and SLG phases Numerical simulation COMSOL Multiphysics Hudi coal mine 

分 类 号：TD712.6[矿业工程—矿井通风与安全]