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首页> 外文期刊>Transport in Porous Media >Characterization of Viscous Fingering and Channeling for the Assessment of Polymer-Based Heavy Oil Displacements
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Characterization of Viscous Fingering and Channeling for the Assessment of Polymer-Based Heavy Oil Displacements

机译：粘性指和通道的表征，用于评估基于聚合物的重油驱替

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The ability to determine a predictive stability criterion is of great practical importance for designing stable polymer-based displacements. Where one usually resorts to a limited number of core-scale experiments or coarse-scale reservoir simulations, the first ones are potentially impacted by length scale issues, while the second ones possibly smooth out sharp displacing fronts and physical instability due to numerical diffusion. This paper proposes a new hydrodynamical stability criterion based on the previous linear stability analysis results. This criterion is tested for 2D polymer oil displacement by performing high viscosity contrasts, high-resolution numerical experiments at pilot scale. We investigate mesh resolution issues and several perturbation ideas. Different factors are considered such as mobility ratios, polymer adsorption and degradation and heterogeneities. The analysis is based on a combination of reservoir simulation and image processing techniques. We show the development of viscous fingering in homogeneous porous media is driven by the shock mobility ratio defined as the ratio of the total fluids upstream mobility over the total fluids downstream mobility. This stability criterion proves to predict both the polymer upstream and polymer-free downstream saturation fronts stability, typical of a polymer displacement, whether polymer adsorbs on the rock or degradates, or not. The observed fingers dynamical behavior is in line with previous works addressing single-phase miscible flow or immiscible oil displacement in porous media: fingers transversally merge while growing in the flow direction. Time evolution of fingers spreading and number is linear. Investigation on porous media of variable heterogeneity distributions shows how viscous fingering couples with heterogeneity and leads to even more marked, distorted and unstable flow patterns. In those cases, flow patterns are not solely driven by the porous medium heterogeneity. The more unstable the flow is, the more sensitive it is to heterogeneity. In-depth fingers analysis shows a very specific time evolution behavior, quite different from viscous fingering in homogeneous media. Such a flow pattern is related to production data such as water and polymer breakthrough times and/or oil recovery profiles as a function of time, which can be used in turn to interpret displacement stability and porous medium heterogeneity features.
机译：确定预测稳定性标准的能力对于设计稳定的基于聚合物的位移非常重要。在通常采用有限数量的岩心规模实验或粗规模油藏模拟的情况下，第一个可能受到长度尺度问题的影响，而第二个则可能消除由于数值扩散而导致的锋利的位移锋面和物理不稳定性。本文在之前的线性稳定性分析结果的基础上提出了一种新的水动力稳定性判据。通过在中试规模上进行高粘度对比，高分辨率数值实验，对该标准进行了2D聚合物油驱替测试。我们研究了网格分辨率问题和一些扰动思想。考虑了不同的因素，例如迁移率，聚合物吸附和降解以及非均质性。该分析基于储层模拟和图像处理技术的结合。我们显示了均质多孔介质中粘性指法的发展是由冲击迁移率所驱动的，冲击率定义为总流体上游迁移率与总流体下游迁移率之比。该稳定性判据证明可以预测聚合物上游和无聚合物下游饱和锋面的稳定性，这是聚合物驱替的典型特征，无论聚合物是否吸附在岩石上或是否降解。观察到的手指动力学行为与先前针对多孔介质中单相混相流动或不混溶油驱替的工作相一致：手指在流动方向上生长时横向合并。手指扩展和数字的时间演化是线性的。对具有不同异质性分布的多孔介质的研究表明，粘性指法如何与异质性耦合，并导致更加明显，失真和不稳定的流动模式。在那些情况下，流动模式不仅由多孔介质的非均质性驱动。流动越不稳定，对异质性越敏感。深入的手指分析显示了非常特定的时间演化行为，与均匀介质中的粘性指法完全不同。这种流动模式与生产数据有关，例如水和聚合物的渗透时间和/或油采收曲线随时间变化，可以依次用来解释位移稳定性和多孔介质非均质性特征。

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