微孔道中残余油膜变形驱替机理研究

Deformation and Displacement Mechanism of Residual Oil Film in Microchannels

为了进一步探讨驱替液的弹性对剩余油的驱替机理,选择上随体的麦克斯韦本构方程建立微孔道中黏弹性流体的流动方程。基于应力张量理论,计算了作用在残余油膜上的法向偏应力差和水平偏应力差。分析比较了不同黏弹性驱替液和油膜宽度对作用于残余油膜的水平偏应力差和法向偏应力差的影响。结果表明:驱替液作用于残余油膜,会使残余油膜受到的水平偏应力和法向偏应力突然变化;黏弹性越大的聚合物溶液,作用在残余油膜上的法向偏应力和水平偏应力就越大,残余油膜的变形越大。

In order to further explore the displacement mechanism of residual oil by the elasticity of displacement fluid,Maxwell constitutive equation of the upper corresponding body was selected to establish the flow equation of viscoelastic fluid in microchannels.Based on the stress tensor theory,the normal deviatoric stress difference and the horizontal deviatoric stress difference acting on the remaining oil film were calculated.The effect of different viscoelastic fluids and oil film widths on the horizontal deviatoric stress difference and normal deviatoric stress difference acting on the residual oil film was analyzed and compared.The results showed that the horizontal deviatoric stress and normal deviatoric stress of the displacement fluid acting on the residual oil film changed suddenly,and the greater the viscoelasticity of the polymer solution was,the greater the horizontal deviatoric stress and normal deviatoric stress acting on the residual oil film were,the greater the deformation of the residual oil film was.