Patent ID: 9441148
Filing Date: 2016-09-13
CPC Classification: C09K,E21B

Claim Text:
1. A method of treating a hydrocarbon containing formation, comprising: (a) providing an aqueous composition to at least a portion of the hydrocarbon containing formation, wherein the composition comprises an anionic surfactant based on an alkoxylated primary alcohol having a branched aliphatic group, which group has an average carbon number of from 9 to 15 and an average number of branches of from 0.5 to 2.5, and having an average of at least 0.5 mole of alkylene oxide groups per mole of primary alcohol wherein the alkylene oxide groups are ethylene oxide groups, propylene oxide groups or mixtures thereof; and wherein the composition additionally comprises an internal olefin sulfonate (IOS); and (b) allowing the composition to interact with hydrocarbons in the hydrocarbon containing formation.