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Related Concept Videos

Micelles01:30

Micelles

Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...

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Surfactant-Nanoparticle Formulations for Enhanced Oil Recovery in Calcite-Rich Rocks.

Hosein Rezvani1, Bernard P Binks1, Duy Nguyen2

  • 1Department of Chemistry, University of Hull, Hull HU6 7RX, U.K.

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|November 12, 2024
PubMed
Summary
This summary is machine-generated.

This study developed a cost-effective surfactant-nanoparticle mixture for enhanced oil recovery (EOR) in oil reservoirs. The blend significantly improved oil recovery by altering rock wettability and enhancing emulsification, showing promise for sustainable EOR operations.

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Area of Science:

  • Materials Science
  • Petroleum Engineering
  • Colloid and Surface Chemistry

Background:

  • Enhanced oil recovery (EOR) is crucial for maximizing hydrocarbon extraction.
  • Colloidal stability of surfactant-nanoparticle mixtures under reservoir conditions presents a significant challenge for EOR.
  • Understanding the synergistic mechanisms between surfactants and nanoparticles in EOR is not fully elucidated.

Purpose of the Study:

  • To formulate a cost-effective surfactant-nanoparticle mixture in formation brine for efficient EOR in calcite-rich reservoirs.
  • To investigate the role of grafted silica nanoparticles and commercial surfactants (AHS and ZN) in enhancing oil recovery.
  • To explore the impact of these mixtures on rock wettability alteration and emulsification.

Main Methods:

  • Covalent grafting of bare silica nanoparticles with epoxysilane.
  • Blending grafted nanoparticles with zwitterionic alkyl hydroxysultaine (AHS) and zwitterionic-nonionic (ZN) surfactants.
  • Evaluating the performance of surfactant-nanoparticle mixtures at solid-fluid and fluid-fluid interfaces, including wettability alteration and emulsification.
  • Conducting oil recovery tests in secondary and tertiary modes using formation brine.

Main Results:

  • Surfactant-nanoparticle blends exhibited pH-responsive behavior, with nanoparticles acting as carriers or surface activity enhancers.
  • Optimum surfactant concentrations increased crude oil recovery by 36 ± 1% original oil in place (OOIP) in secondary spontaneous imbibition.
  • Adding a low particle concentration (0.01 wt %) further enhanced recovery by 14 ± 0.5% OOIP.
  • Tertiary EOR mode achieved an additional 6% OOIP recovery.
  • AHS-particle dispersions showed superior emulsification and higher crude oil recovery compared to ZN-particle dispersions.

Conclusions:

  • The developed surfactant-nanoparticle formulation offers a cost-effective and efficient EOR strategy for calcite-rich reservoirs.
  • Nanoparticles enhance surfactant performance through improved colloidal stability and surface activity, leading to significant wettability alteration and emulsification.
  • The study elucidates the synergistic effects and highlights the importance of emulsification in the EOR performance of these advanced formulations.