Drill string resonance is the major cause of drill tool failure.
钻柱共振是引起深井钻具失效的主要原因。
The failure of collar connection thread is one of the prime drill tool failures.
石油钻铤螺纹联接失效是钻具失效的主要类型。
The air screw drill tool was power equipment which was designed for air drilling.
空气螺杆钻具是专为空气钻井而设计的动力装置。
A novel drill tool threaded connection stress relief groove is proposed in the paper.
减少连接螺纹弯曲应力可以延长钻具连接螺纹的疲劳寿命。
A novel drill tool threaded connection stress relief groove is proposed in the paper.
减少连接螺纹弯曲应力可以延长钻具连接螺纹的疲劳寿命。
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