用井下闭环可变径稳定器控制大位移井的井眼轨迹方法研究

简要地介绍了可变径稳定器的结构及工作原理，在对带有可变经稳定器的钻具组合进行力学分析的基础上，着重论述了控制井眼轨迹的方法，该工具的解决我国大位移井，特别是滩海油气勘探，提高钻井机械钻速，降低钻井成本提供了一条有效的途径。

Study on Extended-reach Well Trajectory Control with Downhole Close-loop Adjustable Stabilizers

The close-loop downhole adjustable stabilizer is the answer to the questions presented in extended-reach wells nowadays, such as how to exert WOB effectively, overcome friction, borehole purification, enhance the rate of penetration and extend the displacement, etc. The structure and principle of the downhole close-loop adjustable stabilizer is introduced in this paper. It also lays emphasis on the method of borehole trajectory control. Meanwhile, this paper presents an effective solution for extended-reach well drilling, especially for offshore drilling, enhance rate of penetration and reduce drilling costs.