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Étude des conditions d’adsorption des tensioactifs sur des surfaces représentatives des roches réservoirs. Application à l’EOR chimique

Abstract : Chemical flooding, which is one method used in Enhanced Oil Recovery (EOR), consists in injecting a surfactant formulation in order to mobilize oil trapped in the reservoir rock. Anionic surfactants such as sulfonate surfactants are generally used as they provide the best performances in terms of oil recovery. However, surfactants loss due to adsorption onto reservoir rock surface has a significant negative economic impact for EOR processes. The aim of this study is to characterize the anionic surfactant layer adsorbed on silica at room temperature. As model surfactant, we used AOT (sodium bis(2-ethylhexyl)sulfosuccinate)) in brine 1.5wt% NaCl. Silica has been chosen to mimic the reservoir rock. AOT aggregates in brine solution have been characterized at different length scales by cryo-TEM and the combination of three scattering techniques (SAXS, MALS, DLS). Results show a polydisperse vesicle size distribution mainly composed of small vesicles (14 nm diameter). The characterization of the adsorbed layer has been done by means of a Quartz Crystal Microbalance with Dissipation Monitoring (QCM-D) and neutron reflectivity. QCM-D follows temporal variations of the resonant frequency (Δf) of a quartz crystal and its dissipation. Results show large frequency and dissipation shifts. We assumed the formation of a thin inhomogeneous layer mainly composed of surfactant vesicles with QCM-D. Neutron reflectivity experiments allowed the determination of the thickness, structure and composition of the adsorbed layer. Combining both techniques gave evidence of vesicle adsorption even during unfavorable conditions.
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  • HAL Id : tel-02865435, version 1

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Julie Wolanin. Étude des conditions d’adsorption des tensioactifs sur des surfaces représentatives des roches réservoirs. Application à l’EOR chimique. Chimie-Physique [physics.chem-ph]. Sorbonne Université, 2018. Français. ⟨NNT : 2018SORUS360⟩. ⟨tel-02865435⟩

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