Abstract
Nonequilibrium adsorption of a commercial polydisperse ethoxylated sulfonate, C 9-Ph-(EO) xSO 3Na ( x = 3–10), onto precleaned and oil-containing reservoir cores has been studied at surfactant concentrations well above the CMC. An analytical HPLC method based on reverved-phase/ion-exchange has been worked out, which can be used to quantify and determine the relative cation affinity of the various EO-sulfonates. Chromatographic effects, which were related to increased adsorption of the low EO-number isomers, were observed for the precleaned core. No preferential adsorption of the different isomers was observed for the oil-containing core. Static equilibrium adsorption onto kaolinite at a surfactant concentration close to the onset of the adsorption plateau showed increased adsorption of the low EO-number isomers, while at very low surfactant concentration the larger EO-number isomers showed preferential adsorption. All experiments were carried out at 70°C using synthetic seawater as the brine.
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