Laboratory results demonstrate that surfactant adsorption on sandstones is minimized and foam performance improved by reducing the ethoxylate chain length in alcohol ethoxy sulfonates and blending unethoxylated and ethoxylated sulfonates to optimize desirable properties. These properties include increased mobility reduction, more gas-oil foam formation, and enhanced surfactant transport in the oil and water, which all appear to be negatively affected by the presence of long ethoxylate chains in a surfactant.

A series of experiments are used to show that laboratory adsorption measurements can only be extrapolated to reservoirs by 1) replicating the anaerobic conditions of reservoirs, 2) matching the reservoir pH in a CO2 flood and 3) differentiating authogenic minerals from drilling mud found in reservoir cores.

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