Abstract In relationship with the potential application of nanoparticle (NP) foam technology in CO2 enhanced oil recovery (EOR) and greenhouse geological storage in tight reservoirs, the rheological properties of the NP-stabilized CO2 foam with surfactant (α-olefin sulfonate-AOS) solution were experimentally investigated. The foam was treated as a power-law non-Newtonian fluid, and the relationships between the shear stress and shear rate as well as the apparent viscosity of foam and foam quality were determined under influential parameters including the NP additive, internal gas type, salinity, and oil presence. Critical foam quality values in the range 91–96% were observed for the NP-stabilized foam, whereas no such values were obtained for the corresponding AOS-CO2 foam. The results show the NP-AOS-CO2 foam has lower viscosity compared to the NP-AOS-N2 foam, and the solution salinity decreases the viscosity of the NP-AOS-CO2 foam, whereas oil presence has no obvious effect on the foam viscosity.

中文翻译：

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纳米粒子稳定二氧化碳泡沫流变学特性的实验研究

摘要 针对纳米颗粒 (NP) 泡沫技术在致密油藏 CO2 提高采收率 (EOR) 和温室地质封存中的潜在应用，NP 稳定的 CO2 泡沫与表面活性剂（α-烯烃磺酸盐-AOS）的流变特性溶液进行了实验研究。将泡沫视为幂律非牛顿流体，在NP添加剂、内部气体类型、盐度等影响参数下，确定了剪切应力与剪切速率之间的关系以及泡沫的表观粘度和泡沫质量和油的存在。NP 稳定泡沫的临界泡沫质量值在 91-96% 范围内，而相应的 AOS-CO2 泡沫没有获得这样的值。