可控弯接头偏心环旋转振动分析

Rotational Vibration Analysis on Eccentric Ring in Controllable Bent Joint

可控弯接头偏心环振动情况直接关系到旋转导向钻井系统的稳定性。本文以全旋转指向式旋转导向钻井工具的导向工况为背景,从偏心环控制可控弯接头导向过程入手分析,对可控弯接头偏心环旋转过程进行了力学分析,建立受力模型。推导了偏心环径向的运动微分方程,计算出了偏心质量引起的离心惯性力。对偏心环进行模态分析,得出各阶振型以及固有频率。为之后全旋转指向式旋转导向钻井工具的结构设计提供理论基础。

The vibration of the eccentric ring of the controllable bent joint is directly related to the stability of the rotary steering drilling system. In this paper, based on the guidance condition of the fully rotary directional drilling tool, the control process of the controllable bend joint is analyzed. The mechanical analysis of the rotating process of the eccentric ring of controllable bending joint is carried out, Build force model. The radial differential equation of motion of the eccentric ring is deduced, and the centrifugal inertia force caused by eccentric mass is calculated. The modal analysis of the eccentric ring is carried out, and the vibration modes and natural frequencies are obtained. This will provide a theoretical basis for the structural design of the all directional rotary steerable drilling tool.