φ71 mm同径开口式导斜楔偏斜（绕障）施工技术

Bypassing Barrier Construction Technique by Deviation with the Same Diameter of φ71mm Open Wedge

摘要:

针对采用绳索取心金刚石钻进工艺施工中深孔和深孔时会经常遇到处理难度很大的复杂孔内事故和补采岩矿心（煤心）的情况，经反复实践、完善、总结出了钻孔同径偏斜（绕障）施工技术。重点介绍了同径开口式导斜楔的加工制作、下井前校验、孔底架桥、投送方法、钻具组合、钻进注意事项及修孔操作要点。采用该项技术可以减少钻孔报废钻尺、节约施工成本和缩短施工工期。

Abstract:

According to the very complicated downhole accidents and supplement coring in medium-length and deep hole with wire-line diamond drilling, the bypassing barrier technique by wedge with same diameter of the borehole was summed up by repeated practice. The process of the wedge, the calibration before running down, hole-bottom bridging, setting method, bottom hole assembly, drilling attentions and hole-repairing operation points were emphasized. The technique is helpful to reduce abandoned drilling length with construction cost saving and short construction period.