可控弯接头偏心环摩擦及扭矩分析

Friction and Torque Analysis on Eccentric Ring in Controllable Bent Sub

可控弯接头导向偏心环受力情况直接关系到其能否完成旋转导向钻井。通过对可控弯接头进行结构简化与力学模型的建立,分析了可控弯接头在承受轴向钻压时的受力情况,并运用取微元的方法对偏心环组所受摩擦力进行分析,分别分析了外偏心环与内偏心环在它们速度相对大小发生变化时各自所受摩擦力与扭矩的情况。得出了驱动内、外偏心环所需要的最大扭矩及可控弯接头导向过程平稳时内、外偏心环速度情况。

The stress environment of controllable bent sub guide eccentric ring is directly related to the quality of the controllable bent sub rotary steering drilling. Through simplifying the structure of controllable bent sub and establishing the mechanical model,the force situation of the controllable bent sub under axial bending force is analyzed. Method of taking the micro units is used to analyze the friction of eccentric rings,friction and torque of the outer ring and inner ring are also analyzed respectively when their relative speed change. Thus the maximum torque to drive the inner ring and the outer ring,as well as the velocity range of the inner ring and the outer ring when the controllable bent sub orientates smoothly are obtained.