Wells – Processes – Distinct – separate injection and producing wells
Patent
1990-05-31
1991-12-31
Suchfield, George A.
Wells
Processes
Distinct, separate injection and producing wells
166268, 166275, 166309, 252 8554, E21B 4322
Patent
active
050763571
ABSTRACT:
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 CO.sub.2, 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 hydroxy-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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Chevron Research & Technology Company
Suchfield George A.
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