煤矿安全2026，Vol.57Issue(6)：49-58,10.DOI:10.13347/j.cnki.mkaq.20241640
不同层理倾角与间距对深部煤层水力裂缝扩展规律的影响研究
Study on the influence of different bedding dip angle and spacing conditions on propagation law of hydraulic fractures in deep coal seams
摘要
Abstract
Deep coal seams often have low permeability and high in-situ stress,and the expansion process of hydraulic fractures in deep coal seams is more complex.To investigate the influence of bedding dip-spacing on the hydraulic fracturing of deep coal seams,a finite element model covering various bedding dips(0°,20°,40°,60°,80°)and spacing(4 m,6 m,8 m)of coal rock hydraulic fracturing fracture propagation is established based on the second-order nominal stress criterion of zero-thickness Cohesive element.The hydraulic fracturing effects of coal rock under different bedding dip-spacing conditions were characterized by the hydraulic frac-ture morphology,the maximum fracture width,fracture length,and bedding dip-spacing ratio,and validated in the ZS67 well of Zhengzhuang Block of Qinshui Basin.The study shows that:when the bedding dip is 40°,the fracture network morphology is the most complex;when the bedding spacing is 6 m,the number of fracture branches reaches its maximum value;when the bedding dip is 40° and the bedding spacing is 6 m,the hydraulic fracture area reaches 0.27 m2,showing the best expansion characteristics,form-ing a multi-layered and multi-directional fracture network structure.Under this condition,the fracture extends 19.57 m along the bed-ding plane,with 14 branches,the maximum fracture width of 5.63 mm,and the fracture length of 48.47 m,with the bedding dip-spa-cing ratio of 7.15.The optimization of 40° and 6 m bedding combination scheme significantly enhances the permeability of the frac-turing fluid through Zhengzhuang Block ZS67 well.关键词
深部煤层/水力压裂/水力裂缝扩展/层理倾角与间距/层理倾角间距比Key words
deep coal seam/hydraulic fracture/hydraulic fracture propagation/bedding dip angle and spacing/bedding dip spacing ratio分类
矿业与冶金引用本文复制引用
李政澔,孔祥伟,何佳,杨婉婷,陈青,徐洲..不同层理倾角与间距对深部煤层水力裂缝扩展规律的影响研究[J].煤矿安全,2026,57(6):49-58,10.基金项目
中海油"十四五"重点规划资助项目(CCL2022RCPS0471RSN) （CCL2022RCPS0471RSN）
