Abstract: In order to compare the difference between the single-stage separator and the two-stage separator, and find out the reasons that the two-stage series separator was not ideal, the two-stage series structure was constructed by using vortex gas-liquid separator as prototype, and through coupling boundary condition, using the Euler-PBM model to establish the numerical simulation model of the two-stage eddy current separator. The simulation results showed that the gas separation effect of the two-stage series separator was better than that of the single-stage separator, but the internal pressure of the two-stage separator was smaller than that of the casing tubing annulus at the corresponding position, which led to the return phenomenon at the vent hole. The outlet of the upper separator had a large pressure difference, the high flow rate and gas-liquid ratio resulted in a significant reduction to the gas separation efficiency of the two-stage separator. When the gas-bearing ratio at the inlet reached 90.0%, the separator failed. The research results had important practical significance for widening the application conditions of ESP, and the research methods had important reference for similar tool simulation.

Key words: Electric submersible pump, Gasliquid separator, Vortex, FBM model, Numerical simulation

摘要： 为了对比单级分离器和两级串联分离器的分气效果,找出两级串联分离器分气效果不理想的原因, 以潜油电泵用涡流气液分离器为原型,构建了两级涡流串联结构,并通过耦合边界条件,采用欧拉模型-PBM 模型建立了两级涡流分离器数值模拟模型。结果表明,两级串联分离器的分气效果明显好于单级分离器,但两级分离器内部压力小于对应位置处的油套环空压力,导致排气孔处出现回流现象,尤其是上部分离器出口处压差大,流速高,流体含气率大,大幅降低了两级分离器的分气效率;当入口含气率达到90.0%时,两级分离器失效。该研究成果对拓宽潜油电泵应用条件具有重要的现实意义,对类似工具模拟具有重要的借鉴作用。

关键词: 潜油电泵, 气液分离器, 涡流, FBM模型, 数值模拟