深部煤层上向穿层水力压裂强化增透技术研究  

Study on Hydraulic Fracturing Permeability-enhancing Technology for Upward Crossing-seam Boreholes of Deep Coal Seam

作　　者：高松[1] GAO Song(Huainan Mining Industry(Group)Co.,Ltd.,Huainan Anhui 232001,China)

机构地区：[1]淮南矿业(集团)有限责任公司

出　　处：《安徽理工大学学报（自然科学版）》2019年第4期72-76,共5页Journal of Anhui University of Science and Technology:Natural Science

基　　金：国家科技重大专项基金资助项目(2016ZX05068);安徽高校自然科学研究基金资助项目(KJ2017ZD10)

摘　　要：水力压裂技术是提高煤层透气性的有效方法之一。综合利用数值模拟、现场工程试验的方法,系统研究了深部低透气煤层底抽巷上向穿层水力压裂强化增透技术及增透效果。研究发现,通过水力压裂,在距离水力压裂孔20~25m范围内的煤体内形成了大量的压裂隙,透气性大幅提高,有效的提高了煤层的透气性;施水力压裂增透技术后,在一个多月的时间里,考察单元内瓦斯抽采纯量均提高2倍以上,与未压裂区相比,预抽达标时间缩短34%,实现了大范围、长时效增透。研究成果为相似煤层赋存条件矿井提供了借鉴。Hydraulic fracturing is one of the effective ways to improve the permeability of coal seams.By means of numerical simulation and field engineering test,this paper systematically studies the enhanced permeability enhancement technology and effect of hydraulic fracturing in deep low permeability coal seam bottom drainage roadway upward through seam.It is found that through hydraulic fracturing,a large number of fracturing cracks are formed in the coal body within the distance of 20~25m from the hydraulic fracturing hole,and the permeability is greatly improved,which effectively improves the permeability of the coal seam.Through underground hydraulic fracturing permeability enhancement test,after over one month’s hydraulic fracturing,the purity of single hole gas extraction was increased by more than two times,and the time of pre-drainage reaching the standard is shortened by 34%compared with the original non-fractured area,thus achieving a large-scale and long-term permeability enhancement.The research results provide a reference for similar coal seam occurrence conditions mine.

关 键 词：低透气性 煤层 水力压裂 增透 

分 类 号：TD80[矿业工程—矿山开采]