煤矿井下扭力冲击旋转扩孔钻进技术

Drilling Technology of Torsional Impact Rotary Reaming in Underground Coal Mine

根据煤矿井下顶板硬岩大直径定向钻孔扩孔钻进需要,提出扭力冲击旋转扩孔钻进技术。基于FLUENT有限元软件模拟分析结果,开展了扭力冲击器小排量化改造研究,进行了扭力冲击器工作性能测试,印证了节流压降、冲击扭矩、节流喷嘴直径以及工作排量等参数的相互关系,证明缩减节流喷嘴直径能够实现扭力冲击器小排量化改造。设计了扭力冲击旋转扩孔钻具组合,讨论了钻压、泵量以及转速等扩孔钻进参数的影响因素与计算方法,完善了扩孔钻进技术参数配套。开展了扭力冲击旋转扩孔钻进现场试验,试验结果表明,φ200 mm钻孔一次扩孔机械钻进效率达到10 m/h,为煤矿井下顶板硬岩大直径定向钻孔高效扩孔提供了技术基础。

According to the reaming requirement for large diameter directional drilling in hard rock of coal mine roof,the drilling technology of torsional impact rotary reaming is put forward.Based on the simulation results of FLUENT finite element software,the research of small displacement quantification transformation of torsion impactor is carried out,and the working performance of torsion impactor is tested.The relationship of throttle pressure drop,impact torque,throttle nozzle diameter and work displacement is verified.It is proved that the small displacement quantification transformation of torsion impactor can be realized by reducing the throttle nozzle diameter.The combination of rotary reaming tools with torsional impact is designed.The influence factors and calculation methods of reaming parameters such as drilling pressure,pump volume and rotational speed are discussed,and the matching of reaming parameters is improved.On this basis,the field test of rotary reaming drilling with torsional impact is carried out.The test results show that the mechanical drilling efficiency of primary reaming ofφ200 mm drilling hole is up to 10 m/h,which provides the technical basis for efficient reaming of large diameter directional drilling of hard rock in coal mine roof.