Effect of Particle Bonding on Screening Efficiency of Drilling Fluid Shaker under Different Vibration Parameters
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摘要: 基于离散单元法与EDEM, 简化钻井液振动筛模型, 探究平动椭圆振型钻井液振动筛在不同振动参数下的颗粒黏结现象对颗粒速度及运动轨迹的影响, 并与振动筛对不同颗粒筛分效率做对比。结果表明: 颗粒黏结作用通过影响颗粒速度与运动轨迹进而影响筛网对颗粒的筛分效率。颗粒黏结作用越大, 形成颗粒团的颗粒数量越多, 颗粒所做抛物运动次数也越多, 颗粒总体速度下降越大, 筛网对颗粒的筛分效率越小。研究结果对在不同工况下充分利用颗粒黏结作用对各种颗粒的影响来增大颗粒筛分效率有借鉴意义。Abstract: Based on the discrete element method and EDEM, the model of drilling fluid shaker was simplified to explore the influence of particle bonding phenomenon on particle velocity and movement trajectory of translational elliptical vibration type drilling fluid shaker under different vibration parameters, and the screening efficiency of different particles was compared with it. The results show that the particle bonding effect affects the particle screening efficiency by affecting the particle velocity and motion trajectory. The larger the binding effect of particles, the more the number of particles forming particle clusters, the more times of parabolic movement of particles, the greater the decrease of the overall velocity of particles, and the smaller the screening efficiency of the sieve mesh to particles. The results can be used as a reference for increasing the screening efficiency of particles by making full use of the effect of particle bonding on various particles under different working conditions.
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Key words:
- drilling fluid shaker /
- discrete element method /
- EDEM /
- screening efficiency
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表 1 颗粒分类与尺寸大小
参数 易透筛 不透筛 难透筛 颗粒1 颗粒2 颗粒3 颗粒1 颗粒2 颗粒3 颗粒1 颗粒2 颗粒直径/mm 0.3 0.4 0.5 1.4 1.6 1.8 0.7 0.6 表 2 颗粒数量与生成速率
参数 易透筛 不透筛 难透筛 颗粒1 颗粒2 颗粒3 颗粒1 颗粒2 颗粒3 颗粒1 颗粒2 颗粒数量/个 500 500 500 1 000 1 000 1 000 500 500 生成速率/(个·s-1) 100 100 100 200 200 200 100 100 表 3 各材料基本参数
材料 泊松比 密度/(kg·m-3) 剪切模量/Pa 材料 恢复系数 静摩擦因数 滚动系数 颗粒 0.25 2 400 5×107 颗粒与颗粒 0.003 0.4 0.15 振动筛与筛网 0.3 7 800 7×1010 颗粒与筛网 0.5 0.5 0.01 表 4 不同振动方向角下的振动参数
方向角/(°) λx/mm λy/mm βx/(°) βy/(°) 10 2.97 2.04 -6.73 75.6 30 2.79 2.29 -21.1 49.1 45 2.55 2.55 -33.7 33.7 50 2.46 2.63 -38.5 38.4 60 2.29 2.78 -48.9 21.1 70 2.14 2.90 -61.4 13.9 表 5 不同振动频率下的振动参数
频率/Hz λx/mm λy/mm βx/(°) βy/(°) 15 2.55 2.55 -33.7 33.7 16 2.55 2.55 -33.7 33.7 17 2.55 2.55 -33.7 33.7 18 2.55 2.55 -33.7 33.7 19 2.55 2.55 -33.7 33.7 20 2.55 2.55 -33.7 33.7 -
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