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在深孔钻进时，一旦发生理卡事故就需反钻杆，使用安全接头可以节省反钻杆这一工序，起到快速处理孔内事故的作用，确保安全。如在苏北某孔，孔深500余米，发生烧钻，经强力提拔，拉力表反映是三吨半时（四股钢绳），拉断螺母折断，钻杆全部提出。一、接头结构（见附图）及使用安全接头是由上接头1、拉断螺母3、六方轴5、六方外套4和下接头7组成。其中六方外套与六方轴起扭转钻具作用，拉断螺母起联接钻具作用。当孔内
In deep hole drilling, in the event of a physical card accident, it is necessary to reverse drill pipe. The use of safety joints can save the process of anti-drill pipe, and can quickly handle the accident within the hole to ensure safety. For example, in a certain hole in northern Jiangsu, the hole is more than 500 meters deep and a fire drill occurs. After being promoted by force, the tension table shows that it was three tons and a half (four strands of steel rope). The broken nut was broken and the drill pipe was all raised. First, the joint structure (see the attached drawing) and the use of safety joints are composed of the upper joint 1, the broken nut 3, the hexagonal shaft 5, the hexagonal outer jacket 4 and the lower joint 7 . Among them, the six-party jacket and the six-party shaft play the role of a torsional drilling tool, and the nut is broken to act as a drilling tool. When inside the hole