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在弯曲状态下旋转的钻铤,由于疲劳破坏,联结丝扣的折断事故是经常发生的。由此要进行昂贵的打捞作业,有时不得不将该井报废。预防这些事故,对于提高钻速,节约投资是有重大意义的。D·伟勒尔和E·秋提出了一种用来降低钻铤联结丝扣折断的新方法。这就是所谓
Drill collars that rotate in a bent state often occur as a result of fatigue failure due to breakage of the threaded fasteners. As a result, expensive salvage operations have to be carried out and the well sometimes has to be scrapped. Preventing these accidents is of great significance to increasing the speed of drilling and saving investment. D · Weile Er and E · autumn proposed a new method to reduce the breakage of the drill collar coupling. This is what we call