【摘要】 用拉格朗日 欧拉模拟方法 ,采用并联毛细管道模型 ,定性地模拟研究了应用于三次强化采油中的三元复合驱 (ASP)溶液在多孔介质中的复杂流动行为。得到了低流速下ASP溶液在并联毛细管道中流动的速度场、应力场和压力场 ,同二次采油中驱油剂 (水 )的结果进行了比较。结果表明 ,三元复合驱流体在多孔介质中流动时 ,表现出明显的非牛顿流特性 ;其应力场的分布具有不对称性 ,在溶液流经收缩喉道时 ,受到的阻力来自高剪切应力和法向应力 ,这些阻力要比具有相同流速的二次驱油液 (水 )高得多。因此 ,在相同的流速下ASP溶液的流动会产生更大的压力降。通过将计算结果同有关的实验结果进行定性的比较 ,验证了拉格朗日 欧拉算法的合理性。更多还原

【Abstract】 In our efforts to develop models for the process of percolation in enhanced oil recovery, a better understanding of the physics of polymeric flow through porous media is required by first. In this work, a Lagrangian Eulerian method is used to qualitatively study the nature of a combinational, alkaline/surfactant/polymer(ASP) flooding solution flow in porous media by considering the flow in an undulating tube pore. Current simulation is based on Phan Thien and Tanner constitutive model and limited to low shear rate(i.e. We =0.6). The comparison between the viscoelastic and the Newtonian flow at same flow rate demonstrates increased flow resistance of ASP due to the presence of the polymer. Furthermore, ASP flow in porous media obviously differs from Newtonian. The stresses distribute asymmetrically around the nips, primarily because the converging/diverging nature of the flow gives rise to stresses which are not solely proportional to the local shear rate. Along the flow direction, the distribution of the first normal stress difference concentrates at the nips and downstream from the nips, while the distribution of the shear stress concentrates at the nips and upstream from the nips. On the other aspect, the work contained in this paper may be viewed as a part of an ongoing attempt to understand the way highly elastic liquid behaves in complex geometries, and to test the roubstness of the Lagrangian Eulerian method. Qualitative agreement between the numerical results of this work and some experimental observations published in literature has been reported.更多还原