Effects of Core Size and Surfactant Choice on Fluid Saturation Development in Surfactant/Polymer Corefloods
Effects of Core Size and Surfactant Choice on Fluid Saturation Development in Surfactant/Polymer Corefloods
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DOI：
10.1021/acs.energyfuels.3c04313
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发表时间：
2024-01-26
期刊：
影响因子：
5.3
通讯作者：
Pini，Ronny
中科院分区：
文献类型：
--
作者：
Rovelli，Andrea;Brodie，James;Pini，Ronny
表面活性剂/聚合物驱油允许在实验室和油田规模上显著增加采收的油。然而，在油藏规模上的应用存在局限性，这可能与基础驱替过程的复杂性和扩大规模工作流程的时间密集性有关。该工作流程的关键是岩心驱替，其用于验证石油采收的程度并提取用于放大的建模参数。为了加强对岩石样品内饱和度分布演变的理解，我们提出了利用X射线计算机断层扫描成像六个不同的表面活性剂/聚合物岩心驱。在这样做时，我们可视化的形成和传播的油银行重建多维饱和度图。我们进行实验，三个不同的核心大小和两种不同的表面活性剂，SBDS/异丁醇配方和L-145- 10 s 90配方，为了解耦这两个参数的影响，在现场观察到的流动行为。我们注意到，石油银行突破后的石油生产主要受表面活性剂选择的影响，SDBS/异丁醇配方显示出较长的低含油量的拖尾生产。另一方面，核心的大小占主导地位的饱和度曲线的自相似性的程度与较小的核心显示较少的重叠在自相似性配置文件。因此，我们强调的差异适用性的分流方法，以较大和较小的核心放大参数提取，从而提供指导的岩心驱，直接成像是不可用的。
Surfactant/polymer flooding allows for a significant increase in oil recovered at both laboratory and field scales. Limitations in application at the reservoir scale are, however, present and can be associated with both the complexity of the underlying displacement process and the time-intensive nature of the up-scaling workflow. Pivotal to this workflow are corefloods which serve to both validate the extent of oil recovery and extract modeling parameters used in upscaling. To enhance the understanding of the evolution of the saturation distribution within the rock sample, we present the utilization of X-ray computed tomography to image six distinct surfactant/polymer corefloods. In doing so, we visualize the formation and propagation of an oil bank by reconstructing multidimensional saturation maps. We conduct experiments on three distinct core sizes and two different surfactants, an SBDS/isbutanol formulation and an L-145-10s 90 formulation, in order to decouple the effect of these two parameters on the flow behavior observed in situ. We note that the oil production post oil bank breakthrough is primarily influenced by the surfactant choice, with the SDBS/isobutanol formulation displaying longer tailing production of a low oil cut. On the other hand, the core size dominated the extent of self-similarity of the saturation profiles with smaller cores showing less overlap in the self-similarity profiles. Consequently, we highlight the difference in applicability of a fractional flow approach to larger and smaller cores for upscaling parameter extraction and thus provide guidance for corefloods where direct imaging is not available.