METHOD AND COMPOSITION FOR ENHANCED HYDROCARBONS RECOVERY

摘要

A method of treating a hydrocarbon containing formation is described. The method includes (a) providing a hydrocarbon recovery composition to at least a portion of the hydrocarbon containing formation, wherein (i) when the salinity of the brine is from 2 wt% to 4 wt%, the composition comprises a blend of a C20-24 internal olefin sulfonate and a C24-28 internal olefin sulfonate wherein the weight ratio of the C20-24 internal olefin sulfonate to the C24-28 internal olefin sulfonate is from 90:10 to 70:30 and (ii) when the salinity of the brine is greater than 4 wt% up to 13 wt% the composition comprises a blend of a C20-24 internal olefin sulfonate and a C15-18 internal olefin sulfonate wherein the weight ratio of the C20-24 internal olefin sulfonate to the C15-18 internal olefin sulfonate is from 90:10 to 70:30; and (b) allowing the composition to interact with hydrocarbons in the hydrocarbon containing formation.