METHOD AND COMPOSITION FOR ENHANCED HYDROCARBONS RECOVERY

摘要

The present invention provides a method of treating a hydrocarbon containing formation comprising (a) providing a hydrocarbon recovery composition to at least a portion of the hydrocarbon containing formation, wherein the composition comprises one or more internal olefin sulfonates having 17 or more carbon atoms, (b) adding water and/or brine from the hydrocarbon formation to the composition, (c) adding a solubilizer which comprises an ethoxylated alcohol wherein the alcohol before ethoxylation had an average molecular weight of at least 220 and (d) allowing the composition to interact with hydrocarbons in the hydrocarbon containing formation. The solubilizer may comprise less than 0.1 wt%, preferably from 0.02 to 0.05 wt%, of the total composition and it may have from 5 to 9 moles of ethylene oxide per mole of alcohol.