期刊
CHEMICAL ENGINEERING SCIENCE
卷 261, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2022.117957
关键词
Classical density functional theory; Chemical enhanced oil recovery; Surfactant; Polyelectrolyte; Competitive adsorption
资金
- National Natural Science Foundation of China [22078088]
- Shanghai Rising-Star Program [21QA1401900]
This study investigates the competitive adsorption mechanism between surfactant and polyelectrolyte on rock surface using classical density functional theory (CDFT). The optimal polyelectrolyte concentration and chain length suitable for different potentials are identified. The study also considers the influence of rock crevices width on displacement effect and proposes a comprehensive evaluation method for polyelectrolytes in terms of both performance and economy.
During the process of chemical enhanced oil recovery (CEOR), surfactants are widely used as they can reduce interfacial tension and change surface wettability, but the huge economic losses caused by the adsorption of surfactants on rock surface need to be resolved. Therefore, polyelectrolyte is introduced to reduce the adsorption amount of surfactant. However, how to select appropriate polyelectrolyte suitable for different reservoirs is always lack of theoretical guidance. Herein, the competitive adsorption mechanism between surfactant and polyelectrolyte on rock surface is studied by classical density functional theory (CDFT). Having investigated the effects of different polyelectrolytes on the adsorption of surfactants, the optimal polyelectrolyte concentration and chain length suitable for different potentials were found. Also, the influence of rock crevices width on displacement effect was considered. Moreover, we proposed a comprehensive evaluation of polyelectrolytes in terms of both the performance and economy. The findings of this study benefit for further understanding of the competitive adsorption in CEOR, and provide guidance for the practical application of polyelectrolytes. (C) 2022 Elsevier Ltd. All rights reserved.
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