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Demulsification of Fluids Produced from Polymer Flooding in Oilfields: A Molecular Dynamics Simulation Study.

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This study investigated demulsifiers for heavy oil emulsions. Demulsifier Y showed superior performance over Demulsifier X, offering better dehydration rates and efficiency in polymer flooding applications.

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interfacial behaviormolecular dynamics simulationpolyether demulsifierpolymer flooding

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Area of Science:

  • Petroleum Engineering
  • Colloid and Surface Science
  • Materials Science

Background:

  • Heavy oil recovery often involves polymer flooding, generating stable oil-in-water emulsions.
  • Effective demulsification is crucial for separating oil and water post-extraction.
  • Partially hydrolyzed polyacrylamide (HPAM) is commonly used but complicates demulsification.

Purpose of the Study:

  • To compare the demulsification performance of two distinct demulsifiers (Demulsifier X and Y).
  • To elucidate the microscopic mechanisms governing demulsification at the oil-water interface.
  • To provide experimental validation for demulsifier selection in heavy oil processing.

Main Methods:

  • Molecular dynamics (MD) simulations of demulsifier interactions with heavy oil, water, and HPAM.
  • Construction of molecular models using BIOVIA Materials Studio.
  • Experimental bottle tests evaluating dehydration rates and oil content under varying conditions (time, temperature, concentration).

Main Results:

  • MD simulations revealed demulsifiers displace HPAM, increase interfacial tension, and reduce interfacial energy.
  • Demulsifier Y demonstrated superior performance compared to Demulsifier X.
  • Demulsifier Y achieved higher dehydration rates with lower dosage, shorter settling times, and lower temperature requirements.

Conclusions:

  • Demulsifier Y is more effective for demulsifying polymer-containing heavy oil emulsions.
  • The study provides mechanistic insights into demulsifier action at the molecular level.
  • Findings support the rational design and application of efficient demulsifiers in the petroleum industry.