A Numerical Gas Fracturing Model of Coupled Thermal,Flowing and Mechanical Effects

作     者：Dan Ma Hongyu Duan Qi Zhang Jixiong Zhang Wenxuan Li Zilong Zhou Weitao Liu 

作者机构：State Key Laboratory of Coal Resources and Safe MiningSchool of MinesChina University of Mining&TechnologyXuzhou221116China School of Resources&Safety EngineeringCentral South UniversityChangsha410083China Beijing Research Institute of Uranium GeologyBeijing100029China State Key Laboratory of Mining Disaster Prevention and ControlShandong University of Science and TechnologyQingdao266590China 

出 版 物：《Computers, Materials & Continua》 (计算机、材料和连续体（英文）)

年 卷 期：2020年第65卷第12期

页      面：2123-2141页

核心收录：

学科分类：0831[工学-生物医学工程（可授工学、理学、医学学位）] 0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0701[理学-数学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China(41977238 and 51804339) the Young Elite Scientists Sponsorship by CAST,the Special Fund for the Construction of Innovative Provinces in Hunan(2019RS2007) the China Postdoctoral Science Foundation(2019T120715 and 2018M640760) the Open Project Fund for State Key Laboratory of Mining Disaster Prevention and Control(MDPC201901) the Fundamental Research Fund for the Central Universities of CSU(2019zzts675) 

主　　题：Gas fracturing thermal-flowing-mechanical model damage evolution numerical model 

摘      要：Gas fracturing,which overcomes the limitation of hydraulic fracturing,is a potential alternative technology for the development of unconventional gas and oil ***,the mechanical principle of gas fracturing has not been learned comprehensively when the fluid is injected into the *** this paper,a damage-based model of coupled thermal-flowing-mechanical effects was adopted to illustrate the mechanical principle of gas *** simulation tools Comsol Multiphysics and Matlab were integrated to simulate the coupled process during the gas ***,the damage evolution of drilling areas under several conditions was fully *** results indicate that the maximum tensile stress,which occurs in the upper and lower of the injection hole,decreases with the increase of the tectonic stress coefficient(TSC).As the TSC increases,shear fractures increase,a crushed area is gradually formed and the seepage area increases *** influence of TSC on fracture expansion is concluded as follows:with the decrease of TSC,the relative width of fractures decreases whilst the depth *** indicates that thermal stress and pore pressure promote the expansion of tensile fractures but restrain the expansion of shear ***,a relatively lower injection gas pressure is required to obtain the same degree of fracturing with a coupled thermal gradient.