煤矿安全2025，Vol.56Issue(8)：32-40,9.DOI:10.13347/j.cnki.mkaq.20231905
不同层理角度对煤岩水力裂缝扩展的影响分析
Analysis of the influence of different bedding angles on hydraulic fractures propagation in coal rock
摘要
Abstract
To explore the impact of different bedding angles on the fractures propagation of coal hydraulic fracturing in coal-rock formations,based on the zero thickness Cohesive unit damage criterion,a finite element model of coal and rock hydraulic fracturing fractures propagation at different bedding angles(0°,30°,45°,60°,90°)is established.The hydraulic fracturing results at different bedding angles are characterized by hydraulic fracture propagation morphology,the number of branch fractures and joint widths.The hydraulic fracture width and pore pressure of coal rock under different horizontal geo-stress difference at different bedding angles are analyzed and verified in well FG-T29 of Shenfu Block.The results show that when the bedding is 0°,the hydraulic fracture spreads after penetrating the first bedding;when the bedding is 30°,the fractures first pass through the first bedding,extend along the direc-tion of the second bedding,and then turn at the bedding;when the bedding is 45°,the fractures turn after extending along the first layer;the cracks of 60° and 90° bedding did not extend to the bedding surface.Compared with the other 4 bedding angles,45° bed-ding coal rock has the largest number of branch fractures(15)and the largest fracture width(6.19 mm)during fracturing.With the in-crease of horizontal geo-stress difference,the crack width of hydraulic fracture decreases and the initiation pressure increases for all the five bedding angles.关键词
水力压裂/层理角度/Cohesive黏聚力模型/裂缝扩展/缝宽/地应力差Key words
hydraulic fracturing/layering angle/Cohesive cohesion model/crack propagation/seam width/geostress difference分类
矿业与冶金引用本文复制引用
徐洲,谢昕,孔祥伟,王存武,陈青,万雄..不同层理角度对煤岩水力裂缝扩展的影响分析[J].煤矿安全,2025,56(8):32-40,9.基金项目
中海油"十四五"规划重大资助项目(CCL2022RCPS0471RSN,CCL2022RCPS0038ESN) （CCL2022RCPS0471RSN,CCL2022RCPS0038ESN）
