基于DEM的钻井振动筛筛面固相颗粒运移规律  

Study on Solid Particle Moving on the Linear Shale Shaker Screen based on DEM

作　　者：周思柱[1] 张思[1] 吕志鹏[1] 李美求[1] 秦伦[1] 

机构地区：[1]长江大学机械工程学院机械结构强度与振动研究所

出　　处：《石油机械》2014年第11期20-24,共5页China Petroleum Machinery

基　　金：湖北省高等学校科技创新团队计划项目"石油机械现代设计技术与方法"(T200906)

摘　　要：基于软球模型和Hertz-Mindlin接触模型建立了钻井振动筛的DEM分析模型,结合三维离散元分析软件EDEM对固相颗粒群在筛面上的运移过程进行仿真。选取了6种不同粒径颗粒,针对固相颗粒在筛面上的抛掷运动、运移速度及透筛率进行了分析。分析结果表明,固相颗粒在筛面主要通过抛掷运动来实现向前运移,且抛掷指数是一个动态变化值;随着振动筛工作的进行,颗粒运移速度逐渐趋于一个稳定值,粒径对运移速度的影响很大,粒径越小,运移速度越小;透筛率在颗粒入口处最大,且沿着筛面逐渐降低,因此在入口处应该让颗粒通过抛掷运动尽快向前运移,以减少颗粒堆积情况,降低透筛率。The DEM analysis model of drilling shaker is established based on soft sphere model and Hertz- Mindlin contact model. Combined with the three-dimensional discrete element analysis software EDEM, the moving process of the solid particles on the shaker screen is simulated. To study the throwing motion of the solid particles, six kinds of different particle sizes are selected to analyze the moving speed and filter ratio. The study results show that the solid particles move on the shaker screen mainly by throwing motion, and the throwing index is a dynami- cally varying value. With the running of shaker, the moving speed of particle gradually becomes a stable value. The particle size has a great impact on the moving speed： the smaller the particle size, the smaller the moving speed. The filter ratio gains the maximum value at the entrance of the shaker screen and gradually decreases along the screen surface. Therefore, the particles should be moved forward as soon as possible by throwing motion at the entrance, so that to reduce the particle accumulation and the filter ratio.

关 键 词：钻井振动筛 离散单元法 固相运移 透筛率 运移速度 

分 类 号：TE254[石油与天然气工程—油气井工程]