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Updated: May 30, 2025

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Compound Surfactant System with Superior Oil Displacement Performance: Balanced Synergistic Effects from Oil-Water

Zifan Song1,2, Xiao Jin3, Xiaolong Wang1,2

  • 1Shandong Key Laboratory of Oilfield Chemistry, Department of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 27, 2025
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Summary

A new oil displacement system using sodium lauric acid ethanolamine sulfonate (HLDEA) and sodium nonylphenol polyoxyethylene ether sulfate (NPES) significantly enhances oil recovery by reducing interfacial tension and controlling rock wettability.

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Area of Science:

  • Petroleum Engineering
  • Surface Chemistry
  • Enhanced Oil Recovery

Background:

  • Crude oil adhesion to resin-asphalt layers limits oil recovery due to strong oil-solid interactions.
  • Conventional oil displacement systems struggle to control wettability of oleophilic rock surfaces, despite reducing interfacial tension.

Purpose of the Study:

  • To develop an efficient oil displacement system combining wettability control and ultralow oil-water interfacial tension.
  • To investigate the synergistic effects of HLDEA and NPES for enhanced oil recovery.

Main Methods:

  • Compounding sodium nonylphenol polyoxyethylene ether sulfate (NPES) and sodium lauric acid ethanolamine sulfonate (HLDEA).
  • Evaluating interfacial tension, wettability (underwater oil contact angle), and system stability under harsh conditions (high temperature and salinity).
  • Assessing oil recovery rates compared to water flooding and a commercial system.

Main Results:

  • The HLDEA + NPES system achieved an ultralow interfacial tension of 3.8 × 10-3 mN·m-1 and an underwater oil contact angle of 157.2°.
  • The system demonstrated stability at temperatures up to 110 °C and high salinity (1 × 105 mg·L-1 NaCl, 7 × 103 mg·L-1 Ca2+).
  • Oil recovery increased by 28.7% over water flooding and 7.8% over a commercial system.

Conclusions:

  • The synergistic effect of HLDEA and NPES enhances interfacial film stability and wettability control.
  • The system effectively balances oil-water and oil-solid interface interactions, promoting oil film peeling and droplet migration.
  • This novel system significantly improves oil recovery rates in challenging reservoirs.