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Surfactant flooding systems are a crucial method for enhancing recovery rates in low-permeability reservoirs. In this study, microemulsions are prepared through the cooperative action of anionic-nonionic surfactants (SPEO-20) and multipolar solutes. The impact of different polar solutes on the system’s phase behavior has been studied. Optimal system salinity was determined by measuring the volumetric expansion parameters of oil and water and conducting salinity scans to study relative phase volumes. Characterization of the system based on interfacial tension, viscosity, and droplet diameter was performed to investigate the displacement mechanisms within porous media. To forecast the performance of the oil displacement system in actual oil field production, core flooding experiments were carried out. The findings demonstrate that the microemulsion system enhances the recovery rate by approximately 20% compared to water flooding.

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Optimization of Microemulsion Flooding Systems Based on Multipolar Solute Synergistic Anionic-Nonionic Surfactant (SPEO-20): Enhancing Oil Recovery in Low Permeability Reservoirs

  • 会议论文

  • 发表日期：

    2025年

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  • Jie-peng Qu,
  • Wei-feng Lv,
  • Yin-hua Wan,
  • Mao-zhang Tian,
  • Long-fei Li

摘要

Surfactant flooding systems are a crucial method for enhancing recovery rates in low-permeability reservoirs. In this study, microemulsions are prepared through the cooperative action of anionic-nonionic surfactants (SPEO-20) and multipolar solutes. The impact of different polar solutes on the system’s phase behavior has been studied. Optimal system salinity was determined by measuring the volumetric expansion parameters of oil and water and conducting salinity scans to study relative phase volumes. Characterization of the system based on interfacial tension, viscosity, and droplet diameter was performed to investigate the displacement mechanisms within porous media. To forecast the performance of the oil displacement system in actual oil field production, core flooding experiments were carried out. The findings demonstrate that the microemulsion system enhances the recovery rate by approximately 20% compared to water flooding.