摘要：基于考虑颗粒表面粘附力的JKR(Johnson-Kendall-Roberts)理论接触模型,建立钻井振动筛的离散元分析模型,针对固相颗粒群在直线和椭圆轨迹筛面上的运移过程进行对比仿真研究。结果表明:直线振动筛颗粒的运移速度略大于椭圆型的;颗粒碰撞次数呈现周期性变化,并且椭圆振动筛的碰撞次数大于直线振动筛的;不同颗粒呈现明显的分层,粒径大的颗粒容易运动到上层,粒径小的颗粒容易运动到底层;受颗粒表面钻井液黏滞阻力的影响,颗粒粒径与筛孔孔径比为0.4~0.6的颗粒透筛率最大,颗粒粒径与筛孔孔径比小于0.4的小颗粒更容易形成颗粒团,阻碍这类颗粒的透筛。

关键词：钻井振动筛；离散单元法；固相运移；透筛率

Abstract： A discrete element model of the shale shaker was developed base d on the JKR （Johnson-Kendall-Roberts） contact model taking into consideration of viscous forces between contacting particles. A comparative simulation investigation on the migration process of solid particle groups was carried out for linear and elliptical movement trajectories of a shaker. The results show that the particle migration speed for the linear motion is greater than that for the elliptical one. The collision times between the particles are periodic and the collision times of the linear vibration are greater than those of the elliptical vibration. Different particles present obvious stratification， the larger particles are easy to be upper， and the smaller particles are easy to be lower. With the effect of viscous force， particles with the ratio of particle diameter and screen aperture between 0.4 and 0.6 have the greatest filter ratio， while smaller particles with the ratio of particle diameter and screen aperture less than 0.4 are easier to form clusters， which hinders their passing through the screen poles. 

Keywords: shale shaker； discrete element method； solid migration； filter ratio