Performance Of APG Used For Enhanced Oil Recovery

In recent years,the application of surfactants in improving oil recovery has been widely concerned.As a kind of green surfactant,alkylpolyglucoside?APG?surfactants are non-toxic non-pollution and biodegradable.The research of alkylpolyglucoside was focused on the daily chemical industry.Its application in oil field production is mainly focused on drilling fluid aspects,but the research and application in oil displacement is less.Therefore,in view of different carbon chain length of green surfactant APG,through the evaluation of the thermal stability,the emulsification properties and adsorption performance screened out the best surfactant.And for the selected surfactants,the tertiary combination flooding was conducted.Jidong crude oil was as the research objective.The interfacial tension and emulsification performance were evaluated.And the indoor physical model experiment was carried out for the evaluation efficiency to enhance oil recovery.The results showed that APG1214,APG0814 and APG0810 had better thermal stability and emulsification performance.APG1214 had the lowest adsorption on the sand.The longer the APG chains,the better the reduction of the interfacial tension.APG1214 decreased the IFT to 10^-3mN/m.Addition of alkaline and polymer to form ASP combination reduce the IFT to 10^-2mN/m.APGs formed water in oil emulsions with crude oil.With the increase of concentration,the emulsification effect was increased.The existence of polymer increased the stability of the emulsions,the dehydration ratio decreased obviously.The indoor oil displacement experiments showed that the pure surfactant APG1214 only improved oil recovery value to 14.9%,while 32.25%oil recovery rate improved for ASP flooding system.