摘要
为增强振动筛的处理能力,满足钻采过程中的不同工况需求,改善现有钻井液振动筛存在的“筛堵”“跑浆”等问题,提出了一种“直线+变椭圆”的双轨迹钻井液振动筛,并基于离散元方法 (discrete element method, DEM)耦合多体系统动力学(dynamics of multi-body system,MBD)的研究方法,对双轨迹振动筛和岩屑颗粒进行联合仿真计算。探究了2种振型下筛网面上的运动轨迹与抛掷指数、筛分过程中多种岩屑颗粒的运动行为以及筛分性能。研究结果发现:变椭圆轨迹下从入料端至出料端筛面的抛掷指数和振动方向角逐渐减小,有利于实现入料端钻井液固液分离与液相透筛,降低出料端岩屑颗粒的破碎和堵筛概率;稳定筛分时,易透筛颗粒基本处于料层底部或已经透筛,难透筛和不透筛颗粒处于料层的中上层;变椭圆轨迹下多种岩屑颗粒的透筛率均高于直线轨迹、平均透筛时间均短于直线轨迹、平均运移速度均大于直线轨迹。研究成果可为钻井液振动筛的性能提升提供参考。
To improve the processing capacity of the shale shaker,meet the needs of different working condi‐tions in the drilling process,and solve the problems of“screen blinding”and“mud runaway”occurring in the exist‐ing shale shaker,a“linear+variable elliptical”dual-track shale shaker was proposed.Then,using the discrete element method(DEM)coupled with the dynamics of multi-body system(MBD),a joint simulation calculation was conducted on the dual-track shale shaker and cuttings particles.Finally,the motion trajectory and throwing index on the screen surface under two vibration modes,the motion behavior of various cuttings particles in the screening process and the sieving performance were investigated.The research results show that the throwing index and vibration direction angle of the screening surface gradually decrease from the feeding end to the discharging end under the variable elliptical trajectory,which is favorable for achieving solid-liquid separation and liquid phase penetration of drilling fluid at the feeding end and reducing the probability of cuttings particle crushing and screen blinding at the discharging end.At the time of stable screening,the easily through-sieve particles are basically at the bottom of the material layer or have passed the sieve,while the difficult through-sieve and no-through-sieve particles are in the middle and upper layers of the material layer.Under the variable elliptical trajectory,the through-sieve rate of various cuttings particles is higher than that under the linear trajectory,the average through-sieve time is less than that under linear trajectory,and the average migration velocity is greater than that under linear trajectory.The research results provide reference for solid treatment at drilling site.
作者
吕志鹏
段铃童
韩庆锋
杨令
闵庆新
Lu Zhipeng;Duan Lingtong;Han Qingfeng;Yang Ling;Min Qingxin(Institute of Mechanical Structure Strength and Vibration,Yangtze University;Cangzhou Huayou Feida Solid Control Equipment Co.,Ltd.)
出处
《石油机械》
北大核心
2025年第8期44-52,59,共10页
China Petroleum Machinery
基金
2017年度湖北省教育厅科学研究计划重点资助项目“李萨如轨迹振动筛耦合作用下液相透筛及固相运移规律研究”(D20171303)。
关键词
双轨迹振动筛
变椭圆
离散元法
筛分特性
耦合多体系统动力学
岩屑颗粒
抛掷指数
dual-track shale shaker
variable ellipse
discrete element method
screening characteristics
coupled dynamics of multi-body system
cuttings particles
throwing index
