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Study on a Nonionic Surfactant/Nanoparticle Composite Flooding System for Enhanced Oil Recovery

肺表面活性物质 提高采收率 表面张力 微模型 纳米颗粒 化学工程 油到位 吸附 洪水(心理学) 石油工程 复合数 浊点 材料科学 化学 复合材料 多孔介质 纳米技术 多孔性 地质学 石油 有机化学 工程类 量子力学 心理治疗师 物理 心理学
作者
Yanfeng He,Kaili Liao,Jinmei Bai,Lipei Fu,Qianli Ma,Xiang Zhang,Zhangkun Ren,Weiyang Wang
出处
期刊:ACS omega [American Chemical Society]
卷期号:6 (16): 11068-11076 被引量:26
标识
DOI:10.1021/acsomega.1c01038
摘要

The composite flooding system composed of a surfactant and nanoparticles has shown great application potential in enhancing oil recovery. However, at present, these research studies are mainly focused on anionic surfactants. Relatively speaking, alkanolamide (CDEA), a nonionic surfactant, has the characteristics of a small adsorption amount on the rock surface, no cloud point, good temperature resistance, and good salt resistance. However, to the best of our best knowledge, there is no research report on the composite flooding system composed of CDEA and nanoparticles. Therefore, the surfactant/nanoparticle (S/NP) flooding system based on CDEA and nano-SiO2 was studied in this paper. The S/NP flooding system (0.1% CDEA + 0.05% SiO2) was constructed based on the performance in reducing the oil–water interfacial tension (IFT) and the stability of the composite system. The IFT between the S/NP flooding system and the crude oil can reach ultra-low values (3 × 10–3 mN/m), and there is no obvious sedimentation within 72 h. The sandpack flood tests show that the oil recovery rate is increased by 16.8% compared with water flooding and finally reaches 58.2%. Based on micromodel flooding tests, the mechanisms of the S/NP flooding system are studied as follows: the synergistic effect of nanoparticles and surfactants can re-enforce its oil–water interface performance and improve the oil displacement efficiency and the Jamin effect of emulsified oil droplets, combined with the thickening property and retention plugging of nanoparticles, improves the sweep efficiency. As the surfactant and nanoparticle used in this study are commercially available industrial products, the research results have important guiding significance for promoting the industrial application of surfactant/nanoparticle composite flooding technology.
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