煤矿安全2024，Vol.55Issue(12)：63-71,9.DOI:10.13347/j.cnki.mkaq.20231310
碎软煤层顶板水力压裂多裂缝穿层扩展规律研究
Study on the law of multi-fracture through-layer propagation of crushed soft coal seam roof by hydraulic fracturing
摘要
Abstract
The effects of different geological parameters,construction parameters,fracturing sequence and other factors on the propagation patterns of multiple cracks and stress interference between cracks in indirect fracturing were analyzed by the extended fi-nite element method(FEM)in order to study the law of multi-fracture through-layer propagation during hydraulic fracturing of crushed soft coal seam roof.The results show that the larger the minimum horizontal principal stress of the roof layer is,the better the spreading effect of the crack in the coal seam is.The greater the thickness of coal layer,the less the possibility of fracture propagation.As the injection rate increases,the length of crack in coal seam increases,but the interference range of stress between cracks increases continuously.The larger the fracture initiation angle,the larger the fracture turning distance,the fracture mainly spreads in the roof.The larger fracture spacing can ensure the uniform expansion of multiple fractures into the coal seam after frac-turing.The length and area of hydraulic fractures formed in coal seam after fracturing are twice as long as those in middle,left and right fractures in different fracture initiation sequences.When the fracture initiation sequence is left side,middle side and right side,the stress interference range will be increased,the fracture initiation pressure will be higher,and the area formed in the coal seam will be smaller.关键词
碎软煤层/应力干扰/多裂缝扩展/穿层扩展/水力压裂Key words
crushed soft coal seam/stress interference/multi-fracture propagation/through-layer extension/hydraulic fracturing分类
矿业与冶金引用本文复制引用
张玉浩,杨永康,王晨龙..碎软煤层顶板水力压裂多裂缝穿层扩展规律研究[J].煤矿安全,2024,55(12):63-71,9.基金项目
国家自然科学基金资助项目(51404167) （51404167）
山西省回国留学人员科研资助项目(HGKY2019038) （HGKY2019038）
山西省青年科学家自然科学基金资助项目(201901D211066) （201901D211066）
