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新钻杆和未到使用寿命的钻杆折断，是一种非正常现象，这种现象在我队生产中不断出现。据初步统计，79年1—10月份，全队共发生断杆事故231次，约占孔内事故总次数的53.08％，处理钻杆折断损失1681个台时，相当一台钻机2.3个月未钻进，极其严重的影响了生产。为了解决钻杆折断问题，我队曾下较大力量进行调查研究并取得一定效果。现将我队钻杆折断情况、折断原因及其预防措施介绍如下。一、钻杆折断情况1．从现场收集的钻杆断头样品看，约有98％的断头发生在丝扣的端部，而且绝大多数是沿着丝扣牙底断开，少数断头尚保留部分螺纹，其比例如表1。
New drill pipe and drill pipe life is not broken, is an abnormal phenomenon, this phenomenon in my team continue to appear. According to preliminary statistics, during the period from January to October 1979, a total of 231 breaking accidents occurred in the whole team, accounting for 53.08% of the total number of accidents in the borehole. When a drill pipe fracture loss of 1,681 units was handled, a considerable 2.3-month drilling rig Drilling, the most serious impact on the production. In order to solve the problem of broken drill pipe, our team has made great efforts to carry out research and achieved some results. Now my team drill pipe breakage, broken reason and preventive measures are as follows. First, the drill pipe break 1. Seen from the scene to collect the drill pipe decapitation samples, about 98% of the decapitation occurred at the ends of the thread, and the vast majority of the thread is broken along the thread base, a small number of decapitation still retains part of the thread, the ratio Table 1.