螺杆钻侧钻分支绕障技术处理绳索取心钻孔事故

绳索取心钻进施工中常出现卡钻、埋钻和钻具断裂事故。一些孔内事故处理需要很长时间,尤其是深孔事故发生后投入了大量的财力、人力进行处理,最终还不一定能取得成功。在此情况下,采用侧钻绕障而避开孔内事故钻具则是一种理想的选择,可大大缩短事故处理时间,避免钻孔报废带来的损失。重庆北碚龙车勘探区ZK6-2孔运用螺杆定向钻进侧钻分支绕障方法取得成功,并积累了宝贵的经验。

Treatment of Accident of Borehole for Wire-line Coring with Obstacle-avoiding Branch by PDM Sidetracking

Drill rod sticking, burying and breaking are common accidents in wire-line coring drilling. Obstacle-avoiding by sidetracking is an ideal choice, accident treating time can be greatly shortened to save the borehole from being abandoned and reduce the loss brought by accident. The paper introduced a case in Chongqing, PDM directional sidetracking was used for obstacle-avoiding branch with success.