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404孔原来设计的倾角是85°，全套设备都已安装好了，准备开钻，这时地质人员发现地下岩层的倾角变陡（85°），如再按原来的角度打下去，将要落空。提出要返工重新按70°的角度来打，当时正是四季度任务紧张的时候，重新安装还要另换钻塔，工人也要窩工，钻探科研究以后建议用定向弯曲的办法来满足地质要求，这样就可以基本上不返工，队领导支持了这个意见，也取得了地质科的同意。
The holes originally designed for 404 holes have a dip angle of 85 °. The complete equipment is installed and ready for drilling. At this moment, the geologic staff found that the dip angle of the underground rock formation is steep (85 °). Proposed to re-press to re-press the angle of 70 ° to play, when it was the fourth quarter when the task was tense, reinstallation will be another change of rig, workers have to nest work, drilling section proposed to use directional bending method to meet the geological Requirements, so basically can not rework, team leaders support this opinion, also obtained the consent of the geology department.