采出液含砂对轴入倒锥式水力旋流器性能的影响

Effect of Sand Content in Produced Liquid on Separation Performance of Axis-in Inverted Cone Hydrocyclone

为研究井下旋流器在含砂工况下的应用并得到最佳分离效果,基于计算流体动力学方法,采用雷诺应力模型,以轴入倒锥式水力旋流器为研究对象,开展采出液含砂对旋流器的流场特性及分离性能影响的数值模拟分析,分析了含砂体积分数的变化对旋流器速度场、压力场、浓度场及分离效率的影响并开展了试验验证。研究结果表明:随着含砂体积分数的逐渐增加,旋流器的油水分离效率呈现出先增大后减小的趋势;在含砂体积分数小于1.0%时,分离效率随着含砂体积分数的增加而增大;在含砂体积分数为1.0%时,分离效率达到最大值98.74%;随着含砂体积分数的继续增加,分离效率随之逐渐降低,在含砂体积分数达到7.0%时,旋流器分离效率降低到97.01%。研究结果可为油水分离水力旋流器的现场应用提供参考。

To study the application of downhole hydrocyclones in sand conditions and obtain the best separation effect,based on the computational fluid dynamics method,the Reynolds stress model is adopted,and the axis-in inverted cone hydrocyclone is taken as the research object to conduct numerical simulation analysis on the effect of the sand in produced fluid on the flow field characteristics and separation performance of the hydrocyclone.The effects of the sand volume fraction on the velocity field,pressure field,concentration field and separation efficiency of the hydrocyclone are analyzed and verified by test.The study results show that:with the gradual increase of the sand volume fraction,the oil-water separation efficiency of the hydrocyclone shows a trend of increasing first and then decreasing.When the sand volume fraction is less than 1.0%,the separation efficiency increases with the sand volume fraction,and reaches a maximum of 98.74%when the sand volume fraction is 1.0%.As the sand volume fraction continues to increase,the separation efficiency decreases,and is reduced to 97.01%when the sand volume fraction reaches 7.0%.The simulation results fit well with the test results,which verifies the accuracy of the numerical simulation results.