采出液黏度对三相分离旋流器性能的影响

发布时间：2018-09-13 13:47

【摘要】：三相分离旋流器是一种用于油田三元采出液气液固三相分离的新型旋流器。基于计算流体动力学(Computational fluid dynamics,CFD)软件Fluent,采用雷诺应力模型(Reynolds stress model,RSM),开展不同采出液混合液相黏度变化对气液固三相分离旋流器速度场、压力特性和脱气除砂效果影响的数值模拟对比分析。研究结果表明:在黏度不大于6.42 m Pa·s时,旋流器受黏度增大的影响,切向速度幅值成降低趋势,切向速度均值降低12.4%,整体上,在研究范围内,该结构旋流器速度场受黏度变化影响相对较小;在黏度不大于6.42 m Pa·s时,旋流器脱气效率和除砂效率均高于80%,旋流器脱气效率最高可达95.97%、对应除砂效率95.19%;研究范围内,混合液黏度变化对旋流器压力降影响较大。随着黏度增加,旋流器溢流压力降逐渐减小、底流压力降逐渐增加。根据相似参数准则,制作了旋流器试验样机,并开展了现场采出液室内试验。模拟与试验结果吻合良好,从而验证了模拟计算结果的可靠性。研究可对适合高黏度介质分离三相分离旋流器的设计提供参考。
[Abstract]:Three-phase separation cyclone is a new type of hydrocyclone used for three-dimensional gas-liquid-solid separation in oil field. Based on the computational fluid dynamics (Computational fluid dynamics,CFD) software Fluent, the Reynolds stress model (Reynolds stress model,RSM) is used to develop the velocity field of gas-liquid-solid three-phase separation hydrocyclone with different liquid viscosity variation. Comparative analysis of pressure characteristics and effect of degassing and sand removal by numerical simulation. The results show that when the viscosity is less than 6.42 m Pa s, the tangential velocity amplitude decreases and the mean tangential velocity decreases by 12.4%. When the viscosity is less than 6.42 m Pa s, the degassing efficiency and sand removal efficiency of the hydrocyclone are both higher than 80, and the maximum degassing efficiency of the cyclone can reach 95.97, corresponding to the sand removal efficiency 95.19. The pressure drop of hydrocyclone is greatly affected by the change of mixed viscosity. With the increase of viscosity, the overflow pressure drop decreases and the bottom pressure drop increases. According to the criterion of similar parameters, the experimental prototype of hydrocyclone was made, and the laboratory test of liquid extraction was carried out in the field. The simulation results are in good agreement with the experimental results, which verifies the reliability of the simulation results. The study can be used as a reference for the design of three-phase separation cyclone suitable for high viscosity dielectric separation.
【作者单位】：东北石油大学机械科学与工程学院;
【基金】：国家教育部高等学校博士学科点专项科研基金(博导类,20132322110002) 国家高技术研究发展计划(863计划,2012AA061303)资助项目
【分类号】：TE93

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