Analysis on Technical Problems of Wire-Line Core Drilling in Xiaoqinling Gold Mine of Tongguan

潼关小秦岭金矿田作为我国重要的黄金资源基地，其深部勘探面临复杂地层、花岗岩高硬度等技术挑战。现场采用绳索取芯钻进工艺，因环状间隙小(3~5 mm)存在岩粉滞留、泵压异常以及岩芯破碎等问题。本文以ZKD8901孔为例，通过现场试验，分析研究绳索取芯钻进技术在硬岩钻进时存在的几个关键技术问题，并提出了相应的改进措施。现场应用表明：通过优化钻具组合和钻进参数，合理调控冲洗液配比，可避免泵压异常、提高岩芯采取率、控制孔斜率。研究成果对相似地区硬岩层绳索取芯钻进工作具有借鉴意义。As an important gold resource base in China, the deep exploration of the Xiaoqinling gold field in Tongguan faces technical challenges such as complex strata and high hardness of granite. The wire-line core drilling technology is adopted in the field. Due to the small annular gap (3~5 mm), there are problems such as rock powder retention, abnormal pump pressure and core breakage. Taking ZKD8901 hole as an example, this paper analyzes and studies several key technical problems of wire-line core drilling technology in hard rock drilling through field test, and puts forward corresponding improvement measures. Field application shows that abnormal pump pressure can be avoided, core recovery rate can be improved and hole slope can be controlled by optimizing BHA and drilling parameters and reasonably regulating drilling fluid ratio. The research results have reference significance for wire-line core drilling in hard rock strata in similar areas.