摘要
对单锥、凹弧、凸弧、双锥段的球座锥段结构等分段压裂易钻球座的内部气固两相流动行为和壁面磨损情况进行数值研究。在数值预测时,气相场采用标准k-ε模型,应用拉格朗日方法中颗粒轨道模型来模拟湍流场中颗粒运动轨迹。给出不同锥度结构球座的内部流动特性以及磨损率情况。结果表明,球座的大柱段、小柱段处流场分布较为均匀,由于砂粒的趋壁效应,近壁处流场存在小幅波动。经过优化的双锥段结构能在控制主流速度梯度和砂粒浓度基础上,降低球座锥面磨损程度。同时,也说明了应用计算流体力学来研究压裂球座内部气固两相流动规律的可行性。
The flow behavior and wall wear of a ball seat in frac sleeve with cone shapes have been studied numerically.The gas flow fields were simulated by means of standard k-εmodel. The effect of instantaneous turbulence on particle tracking was taken into account with the stochastic tracking approach in discrete phase model（ DPM） using Lagrangian method. The flow behavior during the cone part in ball seat was presented,and the changes of flow field and wall wear in ball seat caused by different cone shapes also can be predicted by CFD simulation. The results indicate that The distribution of the flow field in the large column section and the small column section of the ball seat is relatively uniform. Due to the wall effect of the sand,the flow field in the near wall has certain fluctuation. Optimized double cone structure can control the mainstream velocity gradient and sand concentration,and based on that this new design can reduce ball seat wear. Results obtained from the computer modeling have demonstrated the CFD is suitable for modeling an effect of wearing in ball seat on its performance.
作者
马波
MA Bo(SINOPEC Shengli Oilfield Company Science and Technology Department, Dongying 257000, Chin)
出处
《机械强度》
CAS
CSCD
北大核心
2018年第2期488-493,共6页
Journal of Mechanical Strength
基金
中国石化科研项目(P13063)资助~~
关键词
压裂球座
锥段结构
流场分析
磨损率
数值模拟
Frac ball seat
Cone geometry
Flow analysis
Wear
Numerical simulation
