E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
31/14, 166/33
E21B 43/22 (2006.01) C09K 8/592 (2006.01) C09K 8/594 (2006.01) E21B 43/16 (2006.01) E21B 43/24 (2006.01)
Patent
CA 1327444
ABSTRACT A method for recovering oil from a subterranean formation is disclosed wherein an aqueous surfactant solution is injected into the formation to reduce the mobility of gas in a gas-flooding process. The gas may include hydrocarbon gas, inert gas, carbon dioxide, and steam, or mixtures thereof. The surfactant is represented by the general formula Image where R is a linear or branched chain alkyl group with n carbon atoms wherein n ranges from about 6 to about 50, except that if the gas is steam n ranges from about 9 to about 50; Ar is a mononuclear or fused ring dinuclear aryl group; Z is an ionic group consisting of -SO?M+ or -R'SC?M+ wherein M+ is a cation and R' is a linear or branched chain alkyl group of from one to about six carbon atoms; x ranges from 0 to about 20; and y ranges from 3 to about 100.
600993
Reed Ronald L.
Teletzke Gary F.
Borden Ladner Gervais Llp
Exxon Production Research Company
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