坚硬顶板定向水力压裂切顶致裂参数研究  

Study on the Cracking Parameters of Directional Hydraulic Fracturing of Hard Roof

作　　者：齐森 Qi Sen(Shanxi Yamei Daning Energy Co.,Ltd.,Jincheng Shanxi 048000,China)

机构地区：[1]山西亚美大宁能源有限公司,山西晋城048000

出　　处：《山西冶金》2024年第10期131-132,136,共3页Shanxi Metallurgy

摘　　要：为了解决坚硬顶板难垮难落问题,以西山煤电西曲矿为研究背景,利用数值模拟软件对水力压裂进行分析,发现随着压裂时间的推移,裂缝的偏转最终转向平行于最大主应力的方向。同时,对不同应力差、注液速率和钻孔间距下的岩石起裂扩展进行研究,发现随着应力差增大,起裂压力逐步减小,裂缝偏转角逐步增大。而随着钻孔间距的增大,此时的最大缝宽呈现出逐步减小的趋势,扩展半径呈现出逐步增大的趋势。研究结果可为后续水力压裂方案的设计提供参考。In order to solve the problem of hard roof collapse and hard falling,this paper takes Baozigou coal mine as the research background,uses numerical simulation software to analyze hydraulic fracturing,and finds that with the passage of fracturing time,the deflection of fractures finally turns parallel to the direction of maximum principal stress.At the same time,the rock cracking propagation under different stress differences,liquid injection rates and borehole spacing is studied,and it is found that with the increase of stress difference,the cracking pressure gradually decreases,and the fracture deflection angle gradually increases,and with the increase of borehole spacing,the maximum fracture width at this time shows a gradual decreasing trend,and the propagation radius shows a gradual increasing trend,which provides a reference for the design of subsequent hydraulic fracturing schemes.

关 键 词：数值模拟 坚硬顶板 压裂参数 扩展半径 

分 类 号：TD315[矿业工程—矿井建设]