Method for improving calcium ion tolerance of hydrocarbon...

Details Method for improving calcium ion tolerance of hydrocarbon... Method for improving calcium ion tolerance of hydrocarbon...

E - Fixed Constructions

21

B

31/24

E21B 43/22 (2006.01) C09K 7/02 (1980.01)

Patent

CA 1090999

METHOD FOR IMPROVING CALCIUM ION TOLERANCE OF HYDROCARBON POLYMER SULFONATE SURFACTANTS USED IN ENHANCED RECOVERY PROCESSING IN SUBTERRANEAN OIL-BEARING FORMATIONS ABSTRACT OF THE DISCLOSURE A method for increasing the tolerance of hydrocarbon polymer sul- fonate surfactant materials to divalent ions especially calcium when such materials are injected into subterranean formations containing high divalent cation contents which comprises contacting the hydrocarbon polymer sulfonate surfactant with an oxidizing agent at oxidizing conditions. The specific hydrocarbon polymer sulfonate surfactants disclosed are those produced from lower aliphatic olefins such as iso- butylene, butene-1, butene-2 or propylene or other similar olefinic materials which have been polymerized to average equivalent molecular weights of from about 350 to 675 or higher. The preferred oxidizing agent is hydrogen peroxide.

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