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我队在施工301号鑽孔时,由于地质设計对弯曲度要求特别严格(每百公尺弯曲度2°～2°30′,低于或超过这一范圍,就成廢孔),而同时该孔地层条件复杂,开孔由0～3公尺38公分为表土,3公尺38公分至375公尺3公分为复杂的混合岩,其中有許多小夾层如綠泥石英岩,綠泥黑云母片岩,黑云母綠泥石英岩等。当我們在从77公尺鑽到104公尺时就发生了严重的弯曲,仅在27公尺的进尺中就弯曲了3°,为了保証鑽进質量防止产生报廢現象,我們研究使用了鑽铤鑽进,取得了良好效果,达到了地質設計要求。
During the construction of No.301 drilling hole, the team demanded that the degree of curvature of the geological design be particularly strict (bending degree of 2 ° ~ 2 ° 30 ’per hundred meters and falling below or exceeding this range to become waste holes) At the same time, the formation of the hole is complex. The hole is composed of 38 cm of top surface soil (0-3 m), complex mixed rock of 3 cm (38 cm) to 375 m (3 cm), of which there are many small intercalations such as chlorite quartzite, Mud biotite schist, biotite chlorite quartzite and so on. When we went from 77 meters to 104 meters to a serious bend occurred only in the 27-meter footage was bent 3 °, in order to ensure the quality of drilling to prevent the phenomenon of scrap, we studied the use of a drill Collar drilling, and achieved good results, reaching the geological design requirements.