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Related Concept Videos

Distillation: Vapor–Liquid Equilibria01:01

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Distillation is a separation technique that takes advantage of the boiling point properties of disparate elements in a mixture. To perform distillation, we begin by heating a miscible mixture of two liquids with a significant difference in boiling points (at least 20°C). As the solution heats up and reaches the bubble point of the more volatile component, some molecules of the more volatile component transition into the gas phase and travel upward into the condenser, which is a glass tube with...
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Updated: Jun 30, 2026

Measurement of the Rheology of Crude Oil in Equilibrium with CO2 at Reservoir Conditions
10:38

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Published on: June 6, 2017

A Hand-Based Method for Calculating Microemulsion Phase Equilibrium in Chemical Enhanced Oil Recovery.

Chaofeng Pang1,2, Yizhong Zhang1,2, Lina Zhu2

  • 1Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University, Wuhan 434023, China.

ACS Omega
|June 29, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a new 2D Cartesian coordinate method to efficiently calculate microemulsion phase equilibrium for enhanced oil recovery. The method accurately predicts phase behavior, improving reservoir development design.

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Last Updated: Jun 30, 2026

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10:38

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Published on: June 6, 2017

Enhanced Oil Recovery using a Combination of Biosurfactants
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08:18

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Area of Science:

  • Petroleum Engineering
  • Physical Chemistry
  • Chemical Engineering

Background:

  • Microemulsions are vital for enhanced oil recovery (EOR) due to their ability to reduce interfacial tension.
  • Microemulsion phase behavior (Winsor I, II, III) is critical for EOR effectiveness but complex to model.
  • Existing methods like the Hand method have limitations in efficiency and applicability for microemulsion phase equilibrium calculations.

Purpose of the Study:

  • To develop a computationally efficient and accurate method for calculating microemulsion phase equilibrium.
  • To overcome the limitations of traditional methods in handling microemulsion phase transitions in EOR simulations.
  • To provide a practical tool for phase identification and numerical simulation in EOR.

Main Methods:

  • A simplified two-dimensional Cartesian coordinate method is proposed.
  • Pseudocomponent compositions and nodal lines from pseudoternary phase diagrams are mapped onto a planar coordinate system.
  • The method's accuracy and efficiency are compared against the Hand and HLD-NAC methods.

Main Results:

  • The proposed 2D Cartesian method significantly improves computational efficiency compared to the Hand and HLD-NAC methods.
  • The method accurately captures microemulsion phase behaviors dependent on salinity, composition, and surfactant concentration.
  • Validation against experimental data confirms the method's reliability.

Conclusions:

  • The simplified 2D Cartesian method offers a practical and efficient computational tool for microemulsion phase equilibrium.
  • This approach provides theoretical support for phase identification in EOR applications.
  • Accurate phase behavior characterization is crucial for optimizing reservoir development and EOR strategies.