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Illite Dissolution under Sodium Hydroxide Solution: Insights from Reactive Molecular Dynamics.

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|December 23, 2024
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Summary
This summary is machine-generated.

Alkali/surfactant/polymer (ASP) flooding causes reservoir damage by dissolving clay minerals. This study models Illite dissolution in NaOH, revealing how high alkali concentrations hinder cation diffusion and promote hydroxide precipitation, improving oil recovery insights.

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Area of Science:

  • Geochemistry
  • Materials Science
  • Petroleum Engineering

Background:

  • Alkali/surfactant/polymer (ASP) flooding is vital for enhanced oil recovery.
  • Alkalis react with reservoir clays (Illite, montmorillonite, kaolinite), causing damage and reducing oil recovery.
  • Understanding alkali-induced clay dissolution is crucial for optimizing ASP flooding.

Purpose of the Study:

  • To investigate the dissolution mechanism of Illite in NaOH solution using molecular dynamics simulations.
  • To analyze the impact of varying NaOH concentrations on cation diffusion, ion exchange, and product formation.
  • To evaluate the role of protonation and ionic energy changes in Illite dissolution.

Main Methods:

  • Utilized ReaxFF reactive force field and molecular dynamics simulations.
  • Modeled Illite dissolution in NaOH solutions at different concentrations.
  • Analyzed diffusion coefficients, ion interactions, dissolution products, protonation, and ionic energy.

Main Results:

  • Increased NaOH concentration leads to stable metal hydroxide clusters, hindering cation diffusion.
  • Water dissociation and ion exchange occur, with Illite cations precipitating as hydroxides.
  • Protonation propagates into the Illite structure, increasing with NaOH concentration.
  • K+ exhibits the highest reactivity, and intermediate silicate products are unstable.

Conclusions:

  • High NaOH concentrations in ASP flooding can mitigate reservoir damage by altering clay mineral dissolution pathways.
  • Molecular dynamics simulations provide critical insights into the mechanisms of clay-alkali interactions.
  • Findings aid in optimizing ASP flooding strategies for enhanced oil recovery.