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0前言埃塞俄比亚Gidabo灌溉项目要在Gidabo河流下游修建一座水库大坝,为此需要进行可行性地质工程勘察,设计在坝堤轴线上施工5个钻孔,溢洪道施工2个钻孔,工程量240 m。在施工GIBH-6钻孔过程中,孔内出现了机械事故,正确使用打捞钻器具后顺利地解决了孔内事故,取得了良好的经济效
0 Introduction The Gidabo Irrigation Project in Ethiopia requires the construction of a reservoir dam downstream of the Gidabo River. For this purpose, a feasibility geological survey is required to design five boreholes on the dike axis and two boreholes for spillway construction with a work volume of 240 m . During the construction of GIBH-6 drilling process, there was a mechanical accident in the hole. Correct use of the drilling tool after drilling successfully solved the hole accident and achieved good economic efficiency