Mechanistic Insights into Nanoparticle-Modified Polymer Flooding for Enhanced Oil Recovery
Yang H. Zhang Y. Shen J. Li M. Zhang X. Jiang H. Li H. Peng L. Sarsenbekuly B. Kang W.
26 August 2025American Chemical Society
Langmuir
2025#41Issue 3322036 - 22047 pp.
Nanosilica-modified polymer (MNP) flooding significantly enhances crude oil recovery by increasing the sweep efficiency. However, their microscopic displacement mechanisms remain incompletely understood. This study employed a synthesized nanosilica-modified polymer (MNSP) as a displacement agent. Oil displacement efficiency and the remaining oil mobilization mechanisms were evaluated using core flooding experiments and microscopic visualization in etched models. The displacement mechanism was systematically elucidated based on interfacial tension modulation, emulsification efficiency, and wettability alteration. Microscopic displacement experiments demonstrated a recovery ratio of 91.60% for MNSP. Nuclear magnetic resonance displacement analysis revealed crude oil utilization rates of 65.00% in large pores, 25.78% in medium pores, and 9.22% in small pores. The core mechanism involves nanosilica synergistically cooperating with hydrophobic associations to form a three-dimensional network structure at the oil–water interface, reducing interfacial tension. Concurrently, nanosilica induces rock wettability reversal via wedge-film pressure, promotes stable emulsion formation, and enhances oil stripping efficiency. This work systematically elucidates the oil displacement mechanisms of MNSP, providing a theoretical foundation for further research on similar polymer oil displacement mechanisms.
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State Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, 266580, China
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, 266580, China
Oil Production Plant 3 of Changqing Oilfield Company, Changqing Oilfield Company, PetroChina, Shaanxi, Xi’an, 710021, China
Qingdao Huizhi Oilfield Service Company Limited, Qingdao, 266580, China
Petroleum Engineering Technology Research Institute, Shengli Oilfield Branch of Sinopec, Dongying, 257000, China
Kazakh-British Technical University, Almaty, 050000, Kazakhstan
State Key Laboratory of Deep Oil and Gas
School of Petroleum Engineering
Oil Production Plant 3 of Changqing Oilfield Company
Qingdao Huizhi Oilfield Service Company Limited
Petroleum Engineering Technology Research Institute
Kazakh-British Technical University
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