Unstable Displacement of Non-aqueous Phase Liquids with Surfactant and Polymer
Unstable Displacement of Non-aqueous Phase Liquids with Surfactant and Polymer
复制标题
表面活性剂和聚合物对非水相液体的不稳定置换
DOI：
10.1007/s11242-018-1168-1
复制
发表时间：
2018
影响因子：
2.7
通讯作者：
A. Ardekani
中科院分区：
文献类型：
--
作者：
Soroush Aramideh;P. Vlachos;A. Ardekani
本文研究了均质和非均质多孔介质中两种不混溶流体的两相多组分驱替问题。在许多应用中，例如提高石油采收率，流体混合和扩散可能对过程的功效有害。在这里，我们表明，当一个最初的固定相被取代的溶剂（表面活性剂和聚合物）的有限大小的段塞，粘性指显着提高混合和扩散的溶剂。这些影响与介质非均质性引起的影响相似，导致驱油效率降低。我们首先量化的驱油效率受到不同的流度比，Peclet数，和介质的非均质性水平。我们观察到一个非单调的行为，在作为流度比的函数的驱油效率，表明，虽然稳定的正面界面是可取的，在后面的界面上的可混溶粘性指进将最终瓦解的溶剂段塞和降低驱油效率。然后，我们表明，混相粘性指进发展的化学段塞的后界面上，可以大大抑制粘度对比逐渐降低时，使用指数或线性函数，导致驱油效率提高10%，而使用相同的化学品量。为了阐明这种低的驱替效率，我们研究了混合，传播，和界面长度的演变，并表明，虽然较高的粘度比是相当有效的动员最初的固定相在一维位移，他们实际上是有害的二维不稳定的位移，因为它们增强了混合和传播的溶剂。
In this paper, we study two-phase multicomponent displacement of two immiscible fluids in both homogeneous and heterogeneous porous media. In many applications such as enhanced oil recovery, fluid mixing and spreading can be detrimental to the efficacy of the process. Here, we show that when an initially immobile phase is being displaced by a finite-size slug of solvents (surfactant and polymer), viscous fingering significantly enhances mixing and spreading of solvents. These effects are similar to those caused by medium heterogeneity and lead to poor displacement efficiency. We first quantify the displacement efficiency subject to different mobility ratios, Peclet numbers, and levels of medium heterogeneity. We observe a non-monotonic behavior in displacement efficiency as a function of mobility ratio, indicating that although stable frontal interface is desirable, miscible viscous fingering on the rear interface will eventually disintegrate the solvents slugs and reduce the displacement efficiency. Then, we show that miscible viscous fingering developing on the rear interface of the chemical slug could be greatly suppressed when viscosity contrast is gradually decreased using exponential or linear functions, leading to 10% increase in displacement efficiency while using the same amount of chemicals. To elucidate this low displacement efficiency, we study the evolution of mixing, spreading, and interfacial length and show that while higher viscosity ratios are quite effective in mobilizing the initially immobile phase in 1D displacements, they are in fact detrimental in 2D unstable displacements since they enhance mixing and spreading of solvents.