Experimental Investigation of the Effects of the Sizes and Concentrations of SiO<sub>2</sub> Nanoparticles on Wettability Alteration and Oil Recovery
Experimental Investigation of the Effects of the Sizes and Concentrations of SiO<sub>2</sub> Nanoparticles on Wettability Alteration and Oil Recovery
复制标题
SiO<sub>2</sub>纳米颗粒粒径和浓度对润湿性改变及采油效果的实验研究
DOI：
10.1021/acs.energyfuels.3c00415
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发表时间：
2023
期刊：
影响因子：
5.3
通讯作者：
Fujii Hikari
中科院分区：
文献类型：
--
作者：
Abe Kazunori;Negishi Keisuke;Fujii Hikari
利用二氧化硅纳米颗粒提高原油采收率最近引起了研究人员的注意，分离压力被发现是一种很有前途的去除剩余油的机制。以前的研究发现，减小颗粒尺寸和增加纳米颗粒的浓度可以提高分离压力，从而使油更容易被去除。然而，这些研究并不是针对水库环境设计的。在目前的工作中，我们的目标是通过在油藏条件下进行实验润湿性测试和岩心驱替测试以及通过计算分离压力来研究纳米颗粒的大小和浓度的影响。结果表明，颗粒越小，润湿性越好，原油采收率越高。然而，我们没有观察到润湿性变化与浓度之间的相关性。相反，在采油的早期阶段，随着纳米颗粒浓度的增加，驱油率更好，这表明分离压力可能更有效。这些结果表明，颗粒大小和浓度是使用纳米颗粒提高石油采收率的基本参数，即使在油藏环境中也是如此。
The use of silica nanoparticles for enhanced oil recovery has recently attracted the attention of investigators, and the disjoining pressure has been found to be a promising mechanism for removing residual oil. Previous studies have found that decreasing the particle size and increasing the concentration of nanoparticles improves the disjoining pressure, which enables the oil to be removed more easily. However, these studies were not designed for a reservoir environment. In the present work, our goal is to investigate the effects of the sizes and concentrations of nanoparticles by performing experimental wettability tests and core-flooding tests under reservoir conditions and by calculating the disjoining pressure. Our results demonstrate that both wettability alteration and oil recovery are higher with smaller particle sizes. However, we observed no correlation between wettability alteration and concentration. In contrast, the oil-displacement rate was better in the early stages of oil recovery for increased nanoparticle concentrations, suggesting that the disjoining pressure may be more effective then. These results demonstrate that particle sizes and concentrations are essential parameters for enhanced oil recovery using nanoparticles, even in a reservoir environment.