Alkyl polyglucosides for potential application in oil recovery process: Adsorption behavior in sandstones under high temperature and salinity

Abstract This study is primarily focusing on the adsorption behavior of alkyl polyglucosides (APG) in sandstones under high temperature and salinity, which is rarely reported before. The results indicate that the adsorption quantity of APG on the sandstone surface is concentration dependent and the adsorption process is spontaneous in terms of Gibbs free energy change ( Δ G o ), and the adsorption behavior can be exactly fitted by the Langmuir/Freundlich isotherm models. Under the high temperature, APG adsorption at the sandstone is proven to be an entropy-driven spontaneous process. It is also found that, with increasing of solution salinity, the adsorption quantity on sandstone surface increases sharply. The dynamic adsorption behavior of APG suggests that the saturated adsorption quantity is detected at 0.14–0.31 mg/g in porous media, which is much smaller than that under the static condition. Ultimately, the investigation verifies that APG has certain competitive advantages in terms of IFT reduction, wettability alteration, dynamic adsorption loss, pro-environment and cost, causing a great potential for application in enhanced oil recovery.