Interplay of Interfacial and Rheological Properties on Drainage Reduction in CO2 Foam Stabilised by Surfactant/Nanoparticle Mixtures in Brine

Although nanoparticles (NPs) are known to increase foam stability, stabilisation is not observed in all surfactant/NP combinations. The present study evaluates the stability of CO2 foams containing mixtures with attractive or repulsive electrostatic interactions at low pH imposed by presence a high-salinity brine. Three ionic surfactants and two oxide NPs (SiO2 Al2O3) were used combinations similar opposite charges. Surface tension, viscosity, ζ-potential hydrodynamic size experiments allowed analysis based on impact surfactant–NP bulk interfacial properties. All oppositely charged systems improved half-life; however, higher NP concentration was required observe significant effect when more efficient present. Both viscosity rigidity films drastically increased these systems, reducing drainage. mixture SiO2 zwitterionic surfactant showed greatest owing synergy effects, mediated interactions. This that use should be tailored choice achieve an interplay rheological properties able reduce drainage applications involving