隧洞勘察定向钻进连续取心钻具性能验证试验

Performance verification test of directional drilling continuous coring tools for tunnel exploration

摘要:

为解决深埋输水隧洞勘察中传统垂直孔勘察效率低、定向钻具无法实现连续取心的问题，基于绳索取心与定向钻进技术，研制了新型定向钻进连续取心钻具，并搭建室内钻进试验平台，对钻具的定向造斜和连续取心性能进行了验证。结果表明：该钻具性能稳定，能够实现定向钻进与高质量连续取心，实际造斜能力达3.50°/30 m，与理论计算值基本吻合，岩心采取率高达93%~98%，岩石质量指标达80%~91%。本研究为深埋长隧洞工程勘察提供了一种高效、可靠的技术方案，对推动定向钻进连续取心技术的发展具有重要意义。

Abstract:

To address the challenges of low efficiency associated with traditional vertical boreholes and the inability of conventional directional drilling tools to achieve continuous coring in deep-buried water conveyance tunnel exploration， a novel directional drilling continuous coring tool was developed based on wireline coring and directional drilling technologies. An indoor drilling test platform was established to validate the tool''s performance in directional deflection and continuous coring. The results demonstrate that the tool operates stably， successfully achieving directional drilling and high-quality continuous coring. The actual deflection capability reached 3.50°/30 m， closely aligned with the theoretical calculation. The core recovery rate was as high as 93%~98%， with a Rock Quality Designation （RQD） value ranging from 80% to 91%. This research provides an efficient and reliable technical solution for the exploration of deep-buried long tunnels and holds significant importance for advancing the development of directional drilling continuous coring technology.