工矿自动化2026，Vol.52Issue(7)：27-35,9.DOI:10.13272/j.issn.1671-251x.2026030103
中硬煤层长钻孔"射孔-压裂"复合增透区域瓦斯治理技术
Regional gas control technology using long-borehole perforation-fracturing composite permeability enhancement in medium-hard coal seams
摘要
Abstract
To address technical problems such as high fracture initiation pressure and uncontrollable fracture propagation when conventional hydraulic fracturing is used for gas control in medium-hard coal seams,a regional gas control technology based on directional long-borehole perforation-fracturing composite permeability enhancement was systematically investigated against the engineering background of regional gas control at Shaanxi Huangling No.2 Coal Mine Co.,Ltd.through theoretical analysis,numerical simulation,and field tests,and a complete technical system covering parameter optimization,staged fracturing operations,and performance verification was established.The core of this technology was to use high-pressure water-jet perforation to form directional guide slots,thereby reducing the initiation pressure of subsequent hydraulic fracturing by approximately 30％and inducing stable fracture propagation along the perforation direction.Numerical simulations and field tests determined the matching perforation and fracturing parameters as a nozzle diameter of 3.0 mm and a jet pressure of 5 MPa.Field hydraulic fracturing operations were completed in four boreholes using a fracturing-stage spacing of 30-50 m and a fluid injection volume of at least 80 m3 per stage.The application results showed that after the perforation-fracturing composite permeability enhancement technology was applied,the coal-seam fracture initiation pressure was effectively controlled at 11.5-13.7 MPa,lower overall than the conventional fracturing initiation pressure.The radial fracture propagation distance reached 50 m;the average pure gas drainage rate per 100 m of borehole reached 0.226 m3/(min.hm),2.9 and 3.8 times those of slotted boreholes and ordinary boreholes,respectively.The gas drainage volume fraction remained above 67％over the long term.关键词
中硬煤层/瓦斯治理/水力压裂/射孔-压裂/复合增透Key words
medium-hard coal seam/gas control/hydraulic fracturing/perforation-fracturing/composite permeability enhancement分类
矿业与冶金引用本文复制引用
华军,韩桂奇,王彬,贾秉义,刘乐..中硬煤层长钻孔"射孔-压裂"复合增透区域瓦斯治理技术[J].工矿自动化,2026,52(7):27-35,9.基金项目
国家自然科学基金面上项目(52474210) （52474210）
中煤科工西安研究院(集团)有限公司科技创新基金项目(2024XAKF03). （集团）
