摘要
为解决松软煤层(f>0.2)超高压水力割缝期间缝槽发育难控制、易垮孔等问题,通过理论分析手段,分析了割缝缝槽周围煤体应力分布规律,获得了割缝缝槽周围煤体塑性区分布影响因素。研究了高压水射流破煤规律,得到了影响割缝缝槽形态的主要因素为割缝压力、喷嘴直径及煤体自身硬度。提出了基于松软煤层特点的超高压水力割缝缝槽形态控制技术,获得了控制松软煤层缝槽深度、宽度以及发育速度的关键参数为割缝压力、喷嘴直径及压力调节速度。通过现场应用表明,针对松软煤层其缝槽形态控制合理参数为:割缝喷嘴直径2.5~3.0 mm,割缝压力70 MPa,割缝调压间隔3~5 min。验证了松软煤层水力割缝缝槽形态控制技术适用性,可效提高松软煤层水力割缝施工成功率及安全性。
In order to solve the problems of difficult control and easy collapse of slot development during ultra-high pressure hydraulic slotting in soft coal seams(f>0.2),the stress distribution law of the coal body around the sloting slot was analyzed through theoretical analysis methods,and the influencing factors of the plastic zone distribution of the coal body around the sloting slot were obtained.We studied the law of high pressure water jet breaking coal and found that the main factors affecting the morphology of the slotting slot are slotting pressure,nozzle diameter,and the hardness of the coal body itself.A ultra-high pressure hydraulic slotting slot morphology control technology based on the characteristics of soft coal seams was proposed,and the key parameters for controlling the depth,width,and development speed of soft coal seam slots were obtained,including slotting pressure,nozzle diameter,and pressure adjustment speed.Through on-site application,it has been shown that the reasonable parameters for controlling the slot morphology of soft coal seams are as follow,the diameter of the slotting nozzle is 2.5~3.0 mm,the slotting pressure is 70 MPa,and the slotting pressure adjustment interval is 3~5 minutes.The applicability of the hydraulic slotting slot morphology control technology in soft coal seams has been verified,which can effectively improve the success rate and safety of hydraulic morphology construction in soft coal seams.
作者
季飞
Ji Fei(State Key Laboratory of Gas Disaster Monitoring and Emergency Technology,Chongqing 400037,China;CCTEG Chongqing Research Institute,Chongqing 400037,China)
出处
《能源与环保》
2024年第2期29-33,39,共6页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
天地科技股份有限公司科技创新创业资金专项项目(2021-2-TD-ZD008)
国家重点实验室开放基金项目(SKLMRDPC20KF01)
区域创新发展联合基金重点项目(U21A20110)。
关键词
松软煤层
水力割缝
槽形
高压水射流
soft coal seams
hydraulic slotting
slot morphology
high pressure water jet
