煤层坚硬顶板定向长孔水力压裂技术研究及应用  

Research and application of directional long-hole hydraulic fracturing technology of coal seam hard roof

作　　者：高振宇 罗文 郑凯歌 GAO Zhenyu;LUO Wen;ZHENG Kaige(CHN Energy Shendong Coal Group Co.,Ltd.,Yulin 719315,China;CCTEG Xi’an Research Institute(Group)Co.,Ltd.,Xi’an 710077,China)

机构地区：[1]国能神东煤炭集团有限责任公司,陕西榆林719315 [2]中煤科工西安研究院(集团)有限公司,陕西西安710077

出　　处：《煤炭工程》2023年第4期77-81,共5页Coal Engineering

摘　　要：针对煤层顶板坚硬采空区大面积悬顶后突然垮落易引发强矿压动力灾害等问题,采用定向长钻孔分段水力压裂技术弱化煤层顶板,并在布尔台煤矿42108工作面进行现场应用,分别从压裂层位选择、压裂钻孔布置、定向钻孔施工、分段水力压力施工等方面论述了定向长钻孔水力压裂技术,现场结果表明,超前治理工作面中部坚硬顶板面积230.1万m^(2),压裂后顶板来压步距降低了20.83%~27.27%,动载系数较未压裂段降低了5.03%~10.32%,同时利用音频电透视方法对压裂效果检测,判识单个压裂段的弱化影响范围30 m左右,单个压裂钻场弱化影响范围为走向300 m,倾向230 m,实现了对整个工作面坚硬顶板区域性有效弱化治理。In view of the dynamic disaster of strong mine pressure in Buertai Coal Mine which is initiated by large area hanging roof and sudden roof caving of in goaf of hard roof coal seam,directional drilling and segmented hydraulic fracturing were used to weaken the roof in 42108 working face of Buertai Coal Mine.The technology is discussed from the fracturing horizon selection,fracturing borehole layout,directional drilling construction,segmented hydraulic fraction construction.The results show that,using the technology,a large area of 2.301 million m^(2) hard roof was treated in advance;after fracturing,the roof weighting interval decreased by 20.83%~27.27%;the dynamic load coefficient decreased by 5.03%~10.32%compared with the non-fractured section.According to the fracturing effect monitoring with audio-frequency electrical penetration,the weakening influence range of a single fracturing section is about 30m,and the weakening influence range of a single fracturing drilling field is 300m along the strike and 230 m along the dip.The hard roof of the whole working face was effectively weakened.

关 键 词：坚硬顶板 分段水力压裂 超前弱化治理 来压步距 动载系数 

分 类 号：TD327.2[矿业工程—矿井建设]