水力压裂技术在上湾煤矿大采高综采面初采初放中的应用  

Application of hydraulic fracturing technology in the initial mining and releasing of large-height synthesized mining face in Shangwan Coal Mine

作　　者：张立辉 刘建宇 ZHANG Lihui;LIU Jianyu(Shangwan Coal Mine,CHN Energy Shendong Coal Group Co.,Ltd.,Ordos 017209,China)

机构地区：[1]国能神东煤炭集团有限责任公司上湾煤矿,内蒙古鄂尔多斯017209

出　　处：《中国矿业》2023年第S02期186-191,共6页China Mining Magazine

摘　　要：为了解决工作面初采期间顶板难以垮落的问题,在分析现有技术优缺点的基础上,提出采用定向长钻孔分段水力压裂技术弱化工作面初采区域顶板强度,缩短初次垮落步距的治理方法,并在上湾煤矿12403工作面进行工程应用。结果表明:采用理论计算得出工作面在未治理条件下顶板初次垮落步距为67m,存在大面积悬顶风险。经水力压裂施工治理后,工作面推进至15 m时直接顶开始垮落充填采空区,减小老顶垮落时的释放空间。推进至30m时煤层顶板大面积开始垮落,工作面支架压力整体变大,部分区域出现少量片帮情况。推进至44m时老顶初次垮落,来压持续步距为9.6m。验证了定向长钻孔分段水力压裂技术在工作面初次放顶中应用效果显著。In order to solve the problem of difficult roof collapse during the initial mining period of the working face,based on analyzing the advantages and disadvantages of the existing technology,it is proposed to use the directional long drilling segmental hydraulic fracturing technology to weaken the strength of the roof plate in the initial mining area of the working face and shorten the initial collapse distance,and carry out the engineering application in the working face of 12403 in the Shangwan Coal Mine.The results show that:the theoretical calculation shows that the initial roof fall distance of the working face is 67 m under the untreated condition,and there is a risk of large-area overhanging roof.After the hydraulic fracturing construction,when the working face advances to 15 m,the direct roof begins to fall to fill the mining space,which reduces the release space when the old roof collapses.When advancing to 30 m,the roof of the coal seam starts to collapse in a large area,and the overall pressure of the working face support becomes bigger,and a small amount of flakes are appeared in part of the area.When advancing to 44 m,the old roof is collapsed for the first time,the continuous step of incoming pressure is 9.6 m,which verifies that the application of directional long drilling segmental hydraulic fracturing technology in the initial roof release of the working face is effective.

关 键 词：初采初放 定向长钻孔 水力压裂 初次垮落步距 

分 类 号：TD823[矿业工程—煤矿开采]