Abstract
ABSTRACT It is of significance to improve the oil recovery of carbonate reservoirs which are rich in oil resources. Most carbonate rocks are oil-wet or neutral-wet, and the heterogeneity is strong, which makes it difficult to improve crude oil recovery. This paper discussed the effect of foam systems containing surfactant and silica nanoparticles on oil recovery. The influence of surfactant concentration and nanoparticle concentration on the dispersion stability of nanofluid was tested. The effects of nanoparticles on foam performance and wettability were investigated. The results showed that when the surfactant concentration was 0.2 wt%, increasing the nanoparticle concentration appropriately enhanced foam stability and wettability alteration. Core flooding experiments also proved that the addition of nanoparticles significantly improved the oil displacement efficiency of surfactant flooding and foam flooding in fractured carbonated rock cores due to the synergistic effect.
Published Version
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