水力振荡器振动特性分析

摘要

Aiming at the problem of large friction between the drill string and borehole,a hydraulic oscillator of axial vibration antifriction was put forward in this paper.According to the working principles and structural design of hydraulic oscillator,its equations of motion and mechanical properties were analyzed,and the vibration equation of hydraulic oscillator was established in the horizontal well.The analysis of calculation example indicated the frequency of flow area change was proportional to the flow rate,the flow area increased with the increase of the static valve hole diameter,the total axial force decreased with the increase of the static valve hole diameter,the vibration displacement decreased with the increase of static valve hole diameter and installation location and coefficient of friction.The conclusions provide important references for reducing friction,increasing speed and field applications of hydraulic oscillator.%针对大位移井和水平井钻柱与井壁摩阻大的问题,提出一种具有轴向振动减摩作用的水力振荡器.在水力振荡器结构设计、工作原理分析的基础上,建立其运动方程和力学特征模型,确定马达转子和动阀板运动关系,进行马达转子和阀片部分的受力分析,并建立水力振荡器在水平井的振动方程.通过算例分析得到过流面积变化频率与流量成正比,过流面积随静阀孔直径增大而增大,总轴向力随静阀孔直径增大而减小,振动位移随静阀孔直径、安装位置和井壁摩擦系数的增大而减小.现场试验表明,水力振荡器的使用可以减小井壁摩擦,改善钻压传递,钻井提速效果明显.