Due to the vast production of crude oil and consequent pressure drops through the reservoirs, secondary
and tertiary oil recovery processes are highly necessary to recover the trapped oil. Among the different tertiary oil
recovery processes, foam injection is one of the most newly proposed methods. In this regard, in the current investigation,
foam solution is prepared using formation brine, C19TAB surfactant and air concomitant with nano-silica (SiO2) as
foam stabilizer and mobility controller. The measurements revealed that using the surfactant-nano SiO2 foam solution
not only leads to formation of stable foam, but also can reduce the interfacial tension mostly considered as an effective
parameter for higher oil recovery. Finally, the results demonstrate that there is a good chance of reducing the mobility
ratio from 1.12 for formation brine and reservoir oil to 0.845 for foam solution prepared by nanoparticles.
