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《Chinese Science Bulletin》 2016-01
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Several key problems of modern mechanics in shale gas exploitation

LI Shi Hai;DUAN Wen Jie;ZHOU Dong;FAN Zhi Yong;Institute of Mechanics,Chinese Academy of Sciences;  
Investigation of modern mechanics has come into a new stage with the development of modern information technology.In this paper,modern mechanics introduced by Hsue-Shen Tsien has been endowed with new connotation,and the principal research subject,methods and direction of modern mechanics are summarized.Based on the Lagrange equation,the fundamental methods of computational mechanics are classified according to the geometrical description for the physical variants and integration domain of the representative element.The method to obtain mechanical parameters,properties and behaviors of materials with the combined effect of experiments and numerical simulations are proposed.And the integral and differential equations of the representative element are established with this method.The material properties,mechanical behavior of the representative element and the macro mechanical characteristics of the media composed of the representative elements are the key research topics in modern mechanics.The aim of the current material tests is to obtain the stress-strain relationship and the strength for the abstract continuous media.However,modern mechanics could do more.Properties and the evolution process of the material are determined through multi-variable measurement and numerical simulation.The whole field resolution are calculated with numerical methods and verified with monitoring data.Comparing with abundant monitoring data,questions for simulation can be gradually eliminated.The key problem in shale gas exploitation is to investigate the fracture evolution law of the shale under various situations.The technical route for the new method in shale gas exploitation should use modern mechanics to avoid blind argument in engineering scale.With modern mechanics,the limitation of hydraulic fracturing technology could be broken through and new techniques can be explored.The key issues includes:(1) To understand the fracture degree and permeability evolution of the representative element,and search for the relevant theoretical expression.(2) Investigate the problems of seepage-fracture coupling and interaction of particles.(3) New mechanical model for the full scale simulation should be developed,which could establish the relationship between fracture and permeability referring to the concept of fracture degree of the representative element.(4) Validate the fracture parameters calculated by flow and pressure at the wellhead,to provide technical indicators for the engineering design and construction.
【Fund】: 国家重点基础研究发展计划(2015CB250903);; 中国科学院战略性先导科技专项B类(XDB10030303)资助
【CateGory Index】: TE37
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