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一、不论钻杆磨薄或磨扁,当42毫米钻杆磨损到小于38毫米以后,禁止下入孔内。二、加强对钻杆的维护保养工作,凡弯曲的钻杆在未校直以前,严禁下入孔内,同时,为了给钻进创造有利条件,必须预先在井口准备好二根合规格直的备用立根,以便随时掉换弯曲的不合规格的立根。三、下降钻杆时,为了予防钻杆松动脱落,应尽力将钻具拧紧。
First, no matter whether the drill pipe is thin or flat, when the 42 mm drill pipe is worn to less than 38 mm, it is forbidden to enter into the hole. Second, to strengthen the maintenance of the drill pipe work, where the bending of the drill pipe is not straightened, it is strictly prohibited to enter the hole, at the same time, in order to create favorable conditions for drilling must be prepared in advance at the wellhead two straight Stand-by stand-up, in order to replace the bending substandard roots at any time. Third, the drill pipe down, in order to prevent loose drill off, should try to tighten the drill.