Surface active agents are included in most aqueous treating fluids to improve the compatibility of aqueous fluids with the hydrocarbon containing reservoir. A review of the literature indicates very little core flow data to describe the effects to be expected. Traditionally, it is believed that the reduced surface tension will reduce capillary pressure and enhance the recovery of water after the treatment. The reduced water saturation is then believed to result in higher effective gas saturation and higher relative permeability to gas after the treatment.

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