Foams have been proposed for use as mobility control agents and to improve conformance in various EOR processes. Multiple correlation analysis has been used to generate equations relating foam data to the chemical structure of alcohol ethoxylates and alcohol ethoxylate derivatives being considered for use as CO2 "foaming" agents. Important surfactant structure parameters determining foaming performance include molecular weight, mole percent ethylene oxide, and hydrophobe carbon number and chemical structure.

Steam foaming agents have also been studied using multiple correlation analysis. Mobility reduction factors (MRF) observed when an alpha-olefin sulfonate (AOS) and 200°C steam were injected into sand packs could be correlated with AOS concentration and the gas:liquid volume ratio. Branching at the 2-position of AOS surfactants reduced the MRF substantially. This reduction appeared to be related primarily to inductive effects of the side chain.

Other surfactant properties of importance in enhanced oil recovery include critical micelle concentration, cloud point, interfacial tension, and adsorption. These properties have been related to surfactant structure using multiple correlation analysis.

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