05295540 is referenced by 12 patents and cites 8 patents.

The invention is a foam method for improving conformance during a steam flood or carbon dioxide flood in a subterranean, oil-containing formation penetrated by at least one injection well and at least one production well. In a steam flood oil recovery process, sweep efficiency is improved by injecting steam until steam breakthrough occurs at the production well after which a mixture of steam, a noncondensible gas, and an aqueous surfactant-starch solution is injected into the formation. The aqueous surfactant-starch solution forms a stable foam with the formation oil at formation conditions that reduce the permeability of the highly permeable steam swept zones thereby diverting the steam to other portions of the formation containing unswept oil. The starch is used as a partial substitute for the surfactant to improve the cost of the foam-forming mixture without reducing its effectiveness in increasing sweep efficiency.

Title
Foam mixture for steam and carbon dioxide drive oil recovery method
Application Number
7/976638
Publication Number
5295540
Application Date
November 16, 1992
Publication Date
March 22, 1994
Inventor
Ralph V Garling
Irving
TX, US
Nizar F Djabbarah
Richardson
TX, US
Agent
Lawrence O Miller
George W Hager Jr
Alexander J McKillop
Assignee
Mobil Oil Corporation
VA, US
IPC
E21B 43/24
E21B 43/22
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