超深涌水水平孔绳索取心钻具投送和打捞技术

Running-in-hole and fishing technology for the wireline coring tool in ultra-deep horizontal holes with water gushing

摘要:

为了精准查明拟建隧道沿线地质情况，通常采用水平孔绳索取心钻探技术。在超深涌水水平孔绳索取心钻进中，投放、打捞内管总成钻具和打捞器是施工中的难题。因此从研制专用水平钻机、选择大功率泥浆泵、封隔分流涌水、设计绳索取心钻具送绳器、定制专用内平绳索取心钻杆等几方面开展研究。全面分析了泥浆泵压力、钻杆内径大小、钻孔深度、钻杆的密封性、钻孔涌水量、涌水压力、孔壁间隙等因素对投送内管总成钻具和打捞器速度的影响，实现了高效、低成本、绿色钻探技术集成。经过精心组织，成功完成了千米级的大涌水水平孔绳索取心钻探施工，精准查明了隧道洞身段工程地质条件，取得了满意的技术效果，为隧道设计和施工提供了安全保障，也为超深涌水水平孔钻探提供了经验。

Abstract:

In order to accurately find out the geological conditions along the tunnel， horizontal wireline core drilling technology is usually used； however， it is difficult to run drilling tools and fishing tools in ultra-deep water gushing horizontal holes in wireline core drilling. Research was carried out to solve the problem from several aspects， including developing special horizontal drilling rig， selecting the high-power mud pump， sealing off and diverting water gushing， designing the wireline feeder for the wireline drilling tool， custom-making special inner-flush horizontal drilling wireline coring drill rods. The influence factors such as mud pump pressure， drill rod inner diameter size， drilling depth， drill rod water-tightness， drilling water gushing volume， water gushing pressure， borehole annulus， on the speed of running the drilling tools and lifting the fishing gear are comprehensively analyzed. With careful organization， a horizontal hole with large gushing water at the 1000m depth level was successfully completed with wireline core drilling， and with high efficiency and low cost. It also accurately identified the engineering geological conditions along the tunnel， achieving satisfactory technical results. It can provide safety guarantee for tunnel design and construction， and also provide valuable experience for drilling horizontal holes with ultra-deep water gushing.