石智军,董书宁,杨俊哲,许超,郝世俊,李泉新,陈殿赋,姚克,刘建林,田东庄
SHI Zhijun,DONG Shuning,YANG Junzhe,XU Chao,HAO Shijun,LI Quanxin,CHEN Dianfu,YAO Ke,LIU Jianlin,TIAN Dongzhuang

• 1:中煤科工集团西安研究院有限公司
• 2:神华神东煤炭集团有限责任公司

摘要(Abstract)：

保德煤矿大盘区工作面采前瓦斯超前治理模式要求井下定向长钻孔能够沿煤层钻进3000m以上,针对现有技术装备在超长定向钻孔施工中存在滑动钻进困难、进水水路压耗大、有线随钻测量信号传输距离受限、冲洗液无法循环利用等问题,开发了煤矿井下基于螺杆马达水力加压和超长钻具正反扭转给进的滑动钻进减阻工艺、基于回转钻进倾角控制和侧钻分支的复合钻进轨迹控制技术,设计了低压耗进水水路系统、泥浆脉冲无线随钻测量系统和冲洗液净化循环系统,结合保德煤矿生产需要,完成了主孔深度3 353 m、孔径120 mm的顺煤层超长贯通定向孔。钻进效果表明:滑动钻进减阻工艺有效降低了给进力,显著提高了深孔滑动定向钻进能力;基于复合钻进的轨迹控制技术,保证了钻孔轨迹沿煤层定向延伸,并提高了钻进能力和钻进效率;泥浆脉冲无线随钻测量信号长距离传输稳定可靠,克服了有线随钻测量信号传输的局限性;井下冲洗液净化循环系统净化效果良好,实现了井下定向钻进冲洗液循环利用。研究成果对支撑煤矿大区域瓦斯超前治理、以孔代巷工程、水害防治及地质勘探等技术进步具有重要意义。
The pre-mining gas governance mode in Baode coal mine requires that long directional borehole of more than 3 000 m can be drilled along coal seam. In view of the existing technology and equipment, there are technical problems in the construction of ultra-long directional borehole, such as the difficulty of sliding drilling, the large hydraulic pressure consumption in inlet waterway, the limited transmission distance of wireline MWD signal, and incapability of flushing liquid recycle. The technology of friction reduction in sliding drilling based on the hydraulic thrust of DHM and the torsion penetration of the ultra-long drilling tool, the technology of trajectory control with compound drilling based on angle control with rotary drilling and branch drilling are developed. The system of low-pressure water consumption, mud pulse wireless MWD and purification circulatory for flushing fluid are designed. Combined with the production needs of Baode coal mine, an ultra-long in-seam directional borehole through mining face with the depth of 3 353 m and the borehole diameter of 120 mm was completed. The drilling results show that the friction reduction technology of sliding drilling effectively reduces the sliding penetration pressure and improves the ability of deep borehole with sliding drilling markedly; the technology of trajectory control based on compound drilling can control the borehole trajectory effectively, which ensures the borehole along the coal seam, and improves the drilling capacity and efficiency; the signal transmission of mud pulse wireless MWD system is stable and reliable, which overcomes the limitation of signal long-distance transmission by wireline MWD system; the purification circulatory system for flushing fluid has good cleaning effect, which realizes the circulation of flushing fluid in directional drilling. The research results are of great significance to support the advance control of gas in large area of coal mine, the engineering of replacing tunnel with borehole, the prevention and control of water disaster and the geological exploration.

关键词(KeyWords)： 顺煤层;超长定向孔;减阻工艺;复合钻进;侧钻分支;泥浆脉冲;冲洗液净化循环系统
in-seam;ultra-long directional borehole;in-borehole friction reduction technology;compound drilling;sidetracking branch well;mud pulse;purification circulatory system for flushing liquid

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项任务(2016ZX05045-003-001);; 中煤科工集团西安研究院有限公司科技创新基金项目(2019XAYZD01)~~

作者(Author): 石智军,董书宁,杨俊哲,许超,郝世俊,李泉新,陈殿赋,姚克,刘建林,田东庄
SHI Zhijun,DONG Shuning,YANG Junzhe,XU Chao,HAO Shijun,LI Quanxin,CHEN Dianfu,YAO Ke,LIU Jianlin,TIAN Dongzhuang

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