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Green Chemistry Approach Using Biobased Polyphenol-Silicon Complexes for Efficient Oil Displacement and Long-Term Oil

Jianning Yu1,2, Enfeng Yang1,2, Haitao Deng1,2

  • 1Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.

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|March 25, 2026
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Summary

This study introduces novel traditional Chinese medicine (TCM) composite agents for enhanced oil recovery (EOR). These agents effectively displace residual oil and prevent re-adhesion, achieving high recovery rates in tests.

Keywords:
coatingcorrosionoil recoverysolid−liquid interfacesuperspreading

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Area of Science:

  • Petroleum Engineering
  • Materials Science
  • Green Chemistry

Background:

  • Enhanced oil recovery (EOR) is crucial due to rising oil demand.
  • Chemical flooding improves oil recovery but struggles with residual oil caused by oil-solid adhesion.
  • Existing methods like low-salinity water flooding have limited efficacy in resolving residual oil issues.

Purpose of the Study:

  • To develop advanced traditional Chinese medicine (TCM) composite agents for enhanced oil recovery (EOR).
  • To address the challenge of residual oil by creating agents with dual functions: in situ oil displacement and long-term oil isolation.
  • To improve the efficiency and sustainability of crude oil extraction.

Main Methods:

  • Development of TCM composite agents using polyphenol-silicon complexation.
  • Utilizing weak alkaline conditions for agent reaction with silicon to overcome van der Waals forces.
  • Formation of hydrophilic micro/nanostructures via π-π interactions for superoleophobic and nonadhesive properties.
  • Alteration of shale wettability from oil-wet to water-wet.

Main Results:

  • The TCM composite agent effectively displaces oil from micron-scale grooves.
  • Polyphenol-silicon complexes create a durable hydrophilic coating, preventing crude oil adhesion for over a week.
  • Achieved an 88.24% recovery rate in core flooding tests.
  • Successfully altered shale wettability, enhancing oil displacement.

Conclusions:

  • The novel TCM composite agents offer a dual-function solution for residual oil challenges in EOR.
  • This technology enhances oil recovery efficiency and promotes environmentally sustainable practices in the oil industry.
  • The developed agents provide a promising alternative for effective crude oil extraction.