The CO2 foam stabilized with the mixture of CO2-soluble surfactants

Abstract

Abstract The CO2-soluble surfactants have been studied extensively for their ability to reduce gas mobility and provide the essential mobility control in CO2-EOR in recent years. In this paper, the synergism of the mixture was investigated. It was conducted that the cloud pressure points of surfactants mixture were located in the middle of single component. However, the synergism of viscosity was positive absolutely, where the apparent foam viscosity of mixture in sand-pack could increase 22.3% and 8.5% separately, comparing with C12-14NEO2 and C16-18NEO5. Anyway, adding the C16-18NEOx to C12-14NEO2 makes the CO2 foam more stable and viscous and CO2 mobility in reservoir was reduced efficiently.