• steerable sleeve - 引用次数：11

  When the automatic anti-deviation drilling system is in operation ,a relative rotate speed is needed between the steerable sleeve and the drill string to produce essential anti-deviation powers.

  自动垂直钻井系统在工作中,由于纠斜动力的需要,导向活套与钻杆需要保持一个相对转速。

  参考来源 - 自动垂直钻具井下流场建模及受力分析

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