This paper study and design its hydraulic power control system and introduces the tool's automatic down hole closed loop of control principle and ways.
对工具内部的液压控制原理及控制回路进行了研究和设计；
Information transmission between ground and down hole is the of key the closed-loop control system of wellbore trajectory.
地面与井下的信息传输是井眼轨道自动闭环控制的核心。
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