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Highly Robust Nanogels from Thermal-Responsive Nanoparticles with Controlled Swelling for Engineering Deployments.

Xing Liu1, Da Zheng2, Yifu Long3

  • 1Department of Petroleum Engineering, School of Earth Resources, China University of Geosciences, Wuhan 430074, China.

ACS Applied Materials & Interfaces
|February 17, 2023
PubMed
Summary

This study introduces novel, robust nanogels with delayed swelling for enhanced oil recovery. These advanced nanogels overcome limitations of traditional materials, offering improved thermal stability and salinity tolerance in harsh reservoir conditions.

Keywords:
environmentally responsivehydrophilic nanogelshydrophobic nanoparticlesoil recoverythermal integrity

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Petroleum Engineering

Background:

  • Traditional nanogels exhibit rapid swelling, thermal instability, and salinity sensitivity, limiting their effectiveness in subterranean oil recovery.
  • Previous attempts at swelling-delayed nanogels often required high reservoir temperatures, restricting their applicability.

Purpose of the Study:

  • To develop in situ formed, swelling-delayed, and robust nanogels for improved subterranean oil recovery.
  • To overcome the limitations of conventional nanogels in terms of swelling kinetics, thermal stability, and salinity tolerance.

Main Methods:

  • Introduction of radically active monomers with thermally sensitive moieties to hydrophobic nanoparticles.
  • In situ generation of hydrophilic nanogels in brine in response to thermal input.
  • Characterization of nanogel swelling kinetics, thermal stability, and salinity tolerance.

Main Results:

  • Achieved pronounced delayed swelling (up to a week) compared to traditional nanogels (minutes).
  • Demonstrated nanogel formation at ambient temperature, distinct from temperature-triggered hydrolysis methods (>50 °C).
  • Exhibited long-term thermal stability (up to 130 °C) and salinity tolerance in harsh conditions.

Conclusions:

  • The developed nanotechnology enables the conversion of hydrophobic nanoparticles to hydrophilic nanogels with controlled delayed swelling.
  • These robust, swelling-delayed nanogels offer significant advantages for enhanced oil recovery applications.
  • Potential applications include plugging materials and foaming stabilizers for improved conformance control in water and CO2 flooding.