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Guiding-controlling technology of coal seam hydraulic fracturing fractures extension

查看全文 作　　者：Zhai [1,2]Cheng;Li [1,2]Min;Sun [1,2]Chen;Zhang [3]Jianguo;Yang [1,2]Wei;Li [1,2]Quangui 高影响力作者 机构地区：[1]State Key Laboratory of Coal Resources and Mine Safety,China University of Mining & Technology;[2]School of Safety Engineering,China University of Mining & Technology;[3]Zhongping Energy Chemical Group高影响力机构 出　　处：《International Journal of Mining Science and Technology》索引2012年第22卷第6期,共6页高影响力期刊 基　　金：supported by National Natural Science Foundation of China(Grant No.51274195);Natural Science Foundation of Jiangsu Province(Grant No.BK2012571);China Post-doctoral Science Foundation(Grant No.20090450930);National Basic Research Program of China(973 Project)(Grant No.2011CB201205);Youth Foundation of China University of Miningand Technology(Grant No.2007A003) 摘　　要：Aiming at the uncontrollable problem of extension direction of coal seam hydraulic fracturing,this study analyzed the course of fractures variation around the boreholes in process of hydraulic fracturing,and carried out the numerical simulations to investigate the effect of artificial predetermined fractures on stress distribution around fractured holes.The simulation results show that partial coal mass occurs relatively strong shear failure and forms weak surfaces,and then fractures extended along the desired direction while predetermined fractures changed stress distribution.Directional fracturing makes the fractures link up and the pressure on coal mass is relieved within fractured regions.Combining deep hole controlling blasting with hydraulic fracturing was proposed to realize the extension guiding-controlling technology of coal seam fractures.Industrial experiments prove that this technology can avoid local stress concentration and dramatically widen the pressure relief scope of deep hole controlling blasting.The permeability of fractured coal seam increased significantly,and gas extraction was greatly improved.Besides,regional pressure relief and permeability increase was achieved in this study. 关 键 词：Hydraulic FRACTURING Gas extraction FRACTURES Pressure RELIEF and PERMEABILITY INCREASE
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