Method of enhancing recovery of petroleum from an...

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E - Fixed Constructions

21

B

E21B 43/22 (2006.01) C09K 8/594 (2006.01) C09K 8/94 (2006.01) E21B 43/16 (2006.01)

Patent

CA 2043382

ABSTRACT OF THE DISCLOSURE A method for enhancing the recovery of petroleum from an oil bearing formation during injection of a non-condensible gas comprises the at least periodic injection of a foam forming composition or a preformed foam into the reservoir. The foam comprises a mixture of a non-condensible gas, preferably CO2, water and an alpha-olefin sulfonate. The alpha-olefin sulfonate comprises a mixture of hydroxy-sulfonates and alkene-sulfonates wherein the ratio of alkene-sulfonates to hydxoxy-sulfonates is preferably not greater than about 4. In addition, the hydroxy- sulfonates comprises 3-hydroxy and 4-hydroxy-sulfonates wherein the ratio of 3-hydroxy-sulfonates to 4-hydroxy-sulfonates is at least about 2. The method is preferably employed within a light oil bearing formation comprising sandstone.

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