添加剂对纳米胶囊驱油性能影响的细观模拟研究
Effects of additives on oil displacement in nanocapillaries: a mesoscale simulation study
摘要：
我们进行了介观尺度模拟，以调查的效果，添加剂，如表面活性剂和聚合物，在驱油过程中的水和盐水注入。一个多体耗散粒子动力学（MDPD）模型参数化，以再现通过实验或经典分子动力学（MD）获得的物理性质。然后采用MDPD模型模拟水和盐水对正十二烷的驱替，表面活性剂浓度范围为1 wt. %至IOwt. % SDS和0.5wt. %的HPAM。我们观察到，虽然添加剂可以进入毛细管而不堵塞，但表面活性剂浓度和注入速率的特定组合可能导致不良的驱油。这一结果可以从水-壁和（表面介导的）水-油相互作用之间的平衡来理解。因此，我们的研究结果显示了一个有效的逆转的润湿性字符，从水润湿到油润湿，作为界面速度的函数。最后，我们总结了这些结果的影响，涉及添加剂的流体-流体位移。
英文摘要：
We performed mesoscale simulations in order to investigate the effects that additives, such as surfactants and polymers, have in the oil displacement process by water and brine injection. A Many-Body Dissipative Particle Dynamics (MDPD) model was parameterized in order to reproduce physical properties obtained either by experiments or Classical Molecular Dynamics (MD). The MDPD model was then employed to simulate the displacement of n-dodecane by water and brine, with surfactant concentrations ranging from 1 wt. % to 10 wt. % SDS and polymer concentration of 0.5 wt. % HPAM. We observed that while the additives may enter the capillary without clogging, specific combinations of surfactant concentrations and injection rates may lead to poor oil displacement. This result can be understood in terms of the balance between water-wall and (surface-mediated) water-oil interactions. As a consequence, our results show an effective reversal of the wettability character, from water-wet to oil-wet, as a function of the interface speed. We conclude by summarizing the implications such results have on the fluid-fluid displacements involving additives.
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