Polymer nanoparticles based nano-fluid for enhanced oil recovery at harsh formation conditions
Polymer nanoparticles based nano-fluid for enhanced oil recovery at harsh formation conditions
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DOI：
10.1016/j.fuel.2020.117251
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发表时间：
2020-05
期刊：
影响因子：
7.4
通讯作者：
Yanxia Zhou;Xu Wu;Xun Zhong;Sarah Reagen;Shaojie Zhang;Wen Sun;H. Pu;Julia Xiaojun Zhao
中科院分区：
文献类型：
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作者：
Yanxia Zhou;Xu Wu;Xun Zhong;Sarah Reagen;Shaojie Zhang;Wen Sun;H. Pu;Julia Xiaojun Zhao
近年来，纳米流体在提高石油采收率（EOR）中的应用引起了人们的广泛关注，并形成了一个新的研究领域。目前该领域面临的巨大挑战是为高温、高盐度油藏（特别是当存在二价离子时）配制稳定的纳米流体。本文利用聚合物纳米粒子（PolyNPs）和甜菜碱型两性离子表面活性剂形成的纳米复合材料开发了一种新型纳米流体。使用电子显微镜（TEM 和 SEM）、傅里叶变换红外（FTIR）光谱、动态光散射（DLS）等对所开发的纳米复合材料进行了表征。纳米流体在相对高盐度（15 wt% 模拟盐水）和高温（80 °C）超过 30 天的情况下表现出明显的稳定性。通过研究纳米流体与巴肯油的界面张力和油接触角，评估了纳米流体在采油方面的潜力。结果表明，巴肯原油的水油界面张力较原始值降低了99.49%，接触角增加了125.73%。然后，利用饱和巴肯原油的伯里亚岩石，通过岩心驱油实验测试了纳米流体的提高采收率。结果表明，纳米流体的总采油率比对照提高了9.32%。最后，基于动态驱油过程的研究，提出了纳米流体提高采收率的可能机理。结果表明，所开发的纳米流体是一种非常有前途的提高石油采收率的驱油剂。
The application of nano-fluids for enhanced oil recovery (EOR) has attracted noticeable attention and has formed a new research area in recent years. Currently the great challenge for this area is to formulate a stable nano-fluid for oil reservoirs with high-temperature and high-salinity, in particular, when divalent ions are present. In this paper, a novel nano-fluid was developed by using nano-composite formed with polymer nanoparticles (PolyNPs) and a betaine-type zwitterionic surfactant. The developed nano-composite was characterized using electron microscopies (TEM and SEM), Fourier transform infrared (FTIR) spectrometry, dynamic light scattering (DLS), etc. The nano-fluid showed noticeable stability at relatively high salinity (15 wt% simulated brine) and high temperature (80 °C) for more than 30 days. The potential of the nano-fluid in recovering oil was evaluated by investigating the interfacial tension with Bakken oil and the oil contact angle in the nano-fluid. The results showed that the water–oil interfacial tension of the Bakken crude oil decreased by 99.49% and the contact angle increased by 125.73% compared to the original values. Then, the EOR efficiency of the nano-fluid was tested using Berea rocks saturated with Bakken crude oil through core flooding experiments. The results showed that the total oil recovery by nano-fluid is 9.32% higher than that of the control. Finally, the possible mechanism of the nano-fluid for EOR was proposed based on the investigation of dynamic displacing processes. The results demonstrated that the developed nano-fluid is a highly promising oil displacement agent for enhanced oil recovery.