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CO2 flooding technology is one of the most promising methods to enhance oil recovery in unconventional reservoirs. However, achieving CO2 miscibility is challenging in most reservoir conditions. Nanoparticles have been shown to effectively improve CO2 flooding efficiency and reduce miscibility pressures. Therefore, the CO2-nanoparticle composite system holds great potential for further development. This paper aims to investigate the oil recovery mechanism of the CO2-nanoparticle composite system in unconventional reservoirs. Firstly, the effects of nanoparticles on rock wettability and oil-gas interfacial tension are analyzed through experiments conducted under high temperature and pressure conditions. Secondly, nitrogen adsorption experiments, microscopic visualization simulation techniques, and laboratory core flooding experiments are employed to study the influence of nanoparticles on CO2 flooding performance under realistic conditions, elucidating the microscopic mechanisms by which the composite system enhances crude oil recovery.

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Study on the Microscopic Interaction Mechanism Between CO2-nanoparticle Composite System and Shale Oil

  • 会议论文

  • 发表日期：

    2025年

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  • Zhiwen Yang,
  • Yuliang Su,
  • Lei Li,
  • Yunfan Liu,
  • Mingjian Wang,
  • Dian Zhang,
  • Zhaoxue Huang

摘要

CO2 flooding technology is one of the most promising methods to enhance oil recovery in unconventional reservoirs. However, achieving CO2 miscibility is challenging in most reservoir conditions. Nanoparticles have been shown to effectively improve CO2 flooding efficiency and reduce miscibility pressures. Therefore, the CO2-nanoparticle composite system holds great potential for further development. This paper aims to investigate the oil recovery mechanism of the CO2-nanoparticle composite system in unconventional reservoirs. Firstly, the effects of nanoparticles on rock wettability and oil-gas interfacial tension are analyzed through experiments conducted under high temperature and pressure conditions. Secondly, nitrogen adsorption experiments, microscopic visualization simulation techniques, and laboratory core flooding experiments are employed to study the influence of nanoparticles on CO2 flooding performance under realistic conditions, elucidating the microscopic mechanisms by which the composite system enhances crude oil recovery.