期刊
ROYAL SOCIETY OPEN SCIENCE
卷 5, 期 6, 页码 -出版社
ROYAL SOC
DOI: 10.1098/rsos.180076
关键词
polymer flooding; enhanced oil recovery; oil displacement; viscoelasticity; molecular dynamics simulation
资金
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB22040402]
- National Natural Science Foundation of China [11525211, 11472263, 11572307, 11772319]
- CNPC-CAS Strategic Cooperation Research Program [2015A-4812]
- Fundamental Research Funds for the Central Universities [WK2090050040]
- Young Elite Scientists Sponsorship Program by CAST [2016QNRC001]
- National Postdoctoral Program for Innovative Talents [BX201700225]
- Anhui Provincial Natural Science Foundation [1808085QA07]
- China Postdoctoral Science Foundation [2017M620264]
Polymer flooding is a promising chemical enhanced oil recovery (EOR) method, which realizes more efficient extraction in porous formations characterized with nanoscale porosity and complicated interfaces. Understanding the molecular mechanism of viscoelastic polymer EOR in nanopores is of great significance for the advancement of oil exploitation. Using molecular dynamics simulations, we investigated the detailed process of a viscoelastic polymer displacing oil at the atomic scale. We found that the interactions between polymer chains and oil provide an additional pulling effect on extracting the residual oil trapped in dead-end nanopores, which plays a key role in increasing the oil displacement efficiency. Our results also demonstrate that the oil displacement ability of polymer can be reinforced with the increasing chain length and viscoelasticity. In particular, a polymer with longer chain length exhibits stronger elastic property, which enhances the foregoing pulling effect These findings can help to enrich our understanding on the molecular mechanism of polymer enhanced oil recovery and provide guidance for oil extraction engineering.
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