地质装备2026，Vol.27Issue(4)：41-46,6.
基于花岗岩地层全液压钻机成孔特点的清孔工艺改进
Improvement of borehole cleaning process based on the characteristics of hole formation by full hydraulic drill in granite formation
摘要
Abstract
In response to the technical challenge of blurred images caused by wall-attachments in granite areas,this paper systematically analyzed the limitations of conventional hole-cleaning process with clear water circulation after wireline core drilling with full hydraulic drill,based on an underground engineering survey project.The study shows that although this process can remove suspended rock debris,it is notably inadequate in removing dense adhering layer formed by drilling tool rust and mud cake oxidation above water level.To overcome this,a combined hole-cleaning process"high-pressure preliminary flushing+targeted mechanical brushing"is proposed,supplemented by preventive measures such as drilling fluid maintenance and lifting optimization.Comparative tests were conducted for a 420 m borehole(water level 180 m).Test results indicate that the proportion of borehole sections with clear images increased from 68.5%to 88.7%for entire borehole,and from 55.0%to 86.0%for above-water section,representing an increase of 31%and showing marked improvement.It is concluded that the combined process can precisely remove the oxidized adhering layer,making the imaging quality of above-water and below-water sections more consistent,and effectively ensuring the accuracy of fracture identification and geological interpretation.Under special working conditions(fault fracture zones and inclined boreholes),the principle of"wall protection priority,low pressure and large displacement"should be followed.These research results can provide practical reference for refined geological investigation in granite areas.关键词
孔内电视成像/绳索取心钻进/清孔工艺/断层破碎带/斜孔Key words
borehole television imaging/wireline core drilling/borehole cleaning process/fault fracture zone/inclined borehole分类
天文与地球科学引用本文复制引用
唐辉,张瑞松,周兰..基于花岗岩地层全液压钻机成孔特点的清孔工艺改进[J].地质装备,2026,27(4):41-46,6.基金项目
国机集团科研专项(编号:ZDZX2023-7) （编号:ZDZX2023-7）
陕西省秦创原"科学家+工程师"队伍建设项目(编号:2025QCY-KXJ-135) （编号:2025QCY-KXJ-135）
陕西省住建厅科研项目(编号:2025-K04) （编号:2025-K04）
国机集团青年科技基金项目(编号:QNJJ-PY-2025-20) （编号:QNJJ-PY-2025-20）
