Abstract：In order to study the microscopic percolation of foam, the process and mechanism of removing organic solvents, and the effect of nano-silica particles on the foam properties in the porous media, sandstone micromodel was made and nano-silica particles was modified with sodium stearate. The results showed that the formation, breakdown and migration of foam in porous media were simultaneous. The formation was related to the velocity of injection flow, the breakdown was related to the gas diffusion; A small portion of foam was carried out in the form of a bubble chain while most foam was trapped by pore. The removal of pollutants included emulsification, foam stripping and plugging, and plugging was the main way. Modified nano-silica particles can improve the stability of foam obviously, and there was a positive correlation between concentration and stability. The foam stabled by nano-silica particles still has strong stability when the foam was migrated in the simulation column. With the increase of the foam injection volume, the injection pressure and resistance factor increased, and the blocking effect is enhanced.
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