钻井振动筛固相颗粒运动规律  

KINEMATICAL LAW OF SOLIDS PARTICLES ON A SHALE SHAKER

作　　者：朱维兵[1] 晏静江[1] 

机构地区：[1]西华大学机械工程与自动化学院,成都610039

出　　处：《机械工程学报》2005年第10期231-234,共4页Journal of Mechanical Engineering

基　　金：四川省重点学科建设资助项目(SZD-Z02244)。

摘　　要：固相颗粒的运动规律对钻井振动筛的处理量有很大的影响。用固液两相流动理论和紊流理论研究了固相颗粒在淹没状态下的悬浮运动和推移运动规律;建立了钻井液悬浮粒度的计算公式;讨论了固相颗粒实现抛掷运动和悬浮运动的条件,并对起跳后的固相颗粒在钻井液中的运动情况进行了分析。实例计算表明,钻井液沿筛面流动时,沿程各断面处所能悬浮颗粒的粒度是有限的。那些小于悬浮粒度的固相颗粒,将在紊流垂直脉动速度的作用下,作悬浮运动;而那些大于悬浮粒度的固相颗粒,将沉降在筛面上,然后随液流以滑动、滚动及抛掷跳跃的形式运动;且作抛掷跳跃运动的颗粒跳不出钻井液层。固相颗粒的悬浮运动和推移运动,有利于钻井液透过筛网,从而提高筛网处理液相的能力。The kinematical law of solids particles on the screen plays an important role in its fluid flow capacity. On the basis of solid-liquid two-phase flow theory and Turbulent flow theory, the kinematical law of solids particles in inundated condition is studied. The formula of floating size of solids particles is developed. The terms of free flight and floating motions of solids particles are developed. The kinematical behavior of solids particles when they enter free flight motion is discussed. From the analysis of an actual example, the floating size of solids particles of the flow cross-sectional areas along distance is limited when drilling fluid flows along the screen. The solids particles which are smaller than the floating size, will have floating motion with the action of the vertical pulsating speed of turbulent flow. Those which are larger than the floating size will make contact with the screen, and slide, or roll and enter free flight. The height of the free flight of solids particles is not larger than the thickness of drilling fluid. The floating motion and throwing motion of solids particles are of great significance for drilling fluid flowing through the screen, so the flow capacity of the screen will be improved.

关 键 词：钻井振动筛 固相颗粒 悬浮运动 抛掷运动 

分 类 号：TE92[石油与天然气工程—石油机械设备]