Abstract
The measurement of dynamic surface tensions by a differential maximum bubble pressure method has been used to permit the determination of Marangoni surface elasticities associated with the interface between gas and foam-forming surfactant solutions. The method was used to study the behaviour of a number of foam-forming surfactants that are candidates for foam flooding in high salinity, high hardness reservoirs. The surface elasticities exhibited a strong dependence on variables such as surfactant type (or formulation), surface age, surfactant concentration, and dissolved salt concentration. From theory and available literature this variability would be expected to translate into a variability of foam stability and/or effectiveness with the same parameters. Surface elasticity was found to be inversely correlated with mobility reduction factors determined for foams flowing in sandstone corefloods when high surfactant concentrations ( > CMC) were employed. Potential application of the findings to surfactant screening for porous medium applications is discussed.
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