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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Ionic liquids for low-tension oil recovery processes: Phase behavior tests.

Iria Rodriguez-Escontrela1, Maura C Puerto2, Clarence A Miller2

  • 1Universidade de Santiago de Compostela, Santiago de Compostela, Spain.

Journal of Colloid and Interface Science
|June 9, 2017
PubMed
Summary

Surface-active ionic liquids (SAILs) show potential for enhanced oil recovery by reducing interfacial tension. Blends of anionic and cationic SAILs with internal olefin sulfonate surfactants demonstrated the most promising results for mobilizing residual oil.

Keywords:
Enhanced oil recoveryPhase behaviorSurface active ionic liquidSurfactant blend

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Area of Science:

  • Petroleum Engineering
  • Surfactant Chemistry
  • Colloid and Surface Science

Background:

  • Enhanced Oil Recovery (EOR) is crucial for maximizing oil extraction from reservoirs.
  • Chemical flooding using surfactants to reduce oil-brine interfacial tensions (IFTs) is a key EOR strategy.
  • Surface-active ionic liquids (SAILs) are emerging as novel surfactants for EOR applications.

Purpose of the Study:

  • To investigate the phase behavior of Surface-active ionic liquids (SAILs) and their blends for Enhanced Oil Recovery (EOR).
  • To evaluate the potential of SAILs and their blends in mobilizing residual oil by reducing oil-brine interfacial tensions.
  • To determine the optimal surfactant blend composition and conditions for achieving low IFT.

Main Methods:

  • Equilibrium phase behavior determination for various SAILs and surfactant blends with model oils and brine.
  • Microemulsion phase pattern analysis (Winsor I-III-II transition).
  • Measurement of equilibrium interfacial tensions (IFT) at different temperatures and blend ratios.

Main Results:

  • Classical Winsor phase behavior (I-III-II transition) was observed, correlating with low IFTs.
  • Individually tested anionic and cationic SAILs showed limited EOR potential.
  • An anionic/cationic surfactant blend of internal olefin sulfonate (IOS) with [C12mim]Br in synthetic seawater (SW) yielded a low equilibrium IFT of ~2x10^-3 mN/m at 25°C.

Conclusions:

  • SAILs, particularly in anionic/cationic blends, show significant promise for enhancing oil recovery.
  • The optimal blend of IOS and [C12mim]Br in SW is highly effective in reducing interfacial tension for residual oil mobilization.
  • This study highlights the potential of tailored SAIL-based surfactant systems for efficient EOR operations.