电潜泵机组油气分离器的腐蚀研究  

Research on the Corrosion of Oil-gas Separator for Electric Submersible Pump Unit

作　　者：张冠林[1] 张立军[1] 韩锡鹏[1] 晁明伟 谢文献[2] 

机构地区：[1]中国石油大学(华东)机电工程学院 [2]中石化胜利油田分公司胜利采油厂

出　　处：《石油机械》2014年第4期94-96,共3页China Petroleum Machinery

摘　　要：针对电潜泵机组用油气分离器壳体冲蚀情况,利用Solidworks和Fluent软件对其进行数值模拟分析。分析结果表明,在分离器叶轮处,含砂油气混合井液的速度明显高于其他部位,最高可达11.450 0 m/s,远高于国标规定的最大流速2.133 6 m/s;在叶片出口处速度矢量的方向杂乱不一,高速含砂油气混合井液会剧烈地冲击分离器内壁,离心力对分离器壳体内壁产生较大的剪切力;在长期的冲蚀和剪切作用下,分离器壳体变薄,加之腐蚀作用,进而造成分离器壳体断裂落井。为此,对油气分离器进行技术改进——选择氧化锆作为耐磨衬套的材料以及在叶轮下部加入壳体衬套。改进后的油气分离器在胜利油田共应用611套,仅发生分离器筒断落井事故15井次,而2008年就有20井次。改进后的油气分离器有效防止了分离器筒断事故的发生,应用效果显著。In light of the shell erosion of oil-gas separator for electric submersible pump unit, the Solidworks and Fluent softwares were used to conduct a numerical simulation analysis of the shell. The analysis shows that the velocity of sandy oil-gas mixed fluid is noticeably higher at the separator impeller than in other positions. The maximum velocity can reach 11. 450 0 m/s, much higher than the maximum velocity 2. 133 6 m/s provided by the national standard. The direction of velocity vector is in disorder at the blade outlet where high-speed sandy oil-gas mixed fluid will fiercely impact the inner wall of the separator, and the centrifugal force produces remarkable shear force toward the inner wall of the separator shell. Due to the effect of long-term erosion and shear, the separator shell becomes thinner and thinner and the additional effect of corrosion makes the shell break and fall into the well. Therefore, the technological modification of the separator was conducted. Zirconia was selected as the material for wear-resistant bushing. The shell bushing was added at the lower part of impeller. A total of 611 improved separators were applied in Shengli Oilfield. Only 15 accidents of separator breaking and falling took place. However, the number of accidents with the original separator was 20 merely in 2008. It can be seen that the separator shell break- ing has been reduced obviously after modification.

关 键 词：油气分离器 壳体 冲蚀 高速冲击 数值模拟 改进措施 

分 类 号：TE933[石油与天然气工程—石油机械设备]