The application of ultra-dry CO₂-in-water (C/W) foams for the displacement of water-sensitive reservoirs can achieve the double benefits of CO₂ sequestration and enhanced oil recovery (EOR). In this work, ultra-dry C/W foams with 4% v/v water were generated by Cocamidopropyl betaine (CAPB), Nonionic poly(acrylamide) (NPAM) and hydrophobic or hydrophilic nanoparticles (NPs) with different specific surface areas. The foam prepared with hydrophilic NPs exhibited the optimal temperature resistance. Rheological experiments of solutions manifested the characteristics of shear thinning and confirmed the viscoelastic network structure (gel-like behavior). Interfacial tension (IFT) mainly affected the possibility of foam formation but was uncorrelated with foam stability. The density distribution, interfacial shear viscosity and interfacial thickness that were challenging to measure experimentally were obtained through dissipative particle dynamics (DPD) simulations. The results demonstrated that NPs could strengthen the interfacial film by forming a viscous network and generating steric resistance, thus enhancing the foam stability.

超干CO ₂水包(C/W)泡沫在水敏油藏驱替中的应用可实现CO ₂的双重效益封存和提高石油采收率 (EOR)。在这项工作中，由椰油酰胺丙基甜菜碱 (CAPB)、非离子聚丙烯酰胺 (NPAM) 和具有不同比表面积的疏水或亲水纳米粒子 (NPs) 生成了含有 4% v/v 水的超干 C/W 泡沫。用亲水性纳米颗粒制备的泡沫表现出最佳的耐温性。溶液的流变实验表现出剪切稀化特性，证实了粘弹性网络结构（凝胶状行为）。界面张力（IFT）主要影响泡沫形成的可能性，但与泡沫稳定性无关。通过耗散粒子动力学 (DPD) 模拟获得了难以通过实验测量的密度分布、界面剪切粘度和界面厚度。