Foam for improving sweep efficiency in subterranean oil-bearing formations
August 10, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3342261 3368624 3490533 Selective plugging of formations with foam Temporarily plugging a subterranean reservoir with a self-foaming aqueous solution Foamable compositions and formations treatment Foamable compositions and formations treatment Gel for retarding water flow Crosslinked polymers for enhanced oil recovery Gel and process for preventing loss of circulation, and combination process for enhanced recovery InventorAssigneeApplicationNo. 566027 filed on 08/10/1990US Classes:166/270, Injecting a composition to adjust the permeability (e.g., selective plugging)166/295, Organic material is resin or resinous166/300, Chemical inter-reaction of two or more introduced materials (e.g., selective plugging or surfactant)166/401, Injecting a gas or gas mixture507/203, Contains organic component507/225, Nitrogen is attached directly or indirectly to the acrylic acid monomer or derivative by nonionic bonding (e.g., acrylamide, acrylonitrile, etc.)507/254, The sulfur is part of a sulfate group507/259, The sulfur is part of a sulfonate group507/261, Organic component contains ether linkage (e.g., PEG ether, etc.)507/935, ENHANCED OIL RECOVERY523/130Composition for plugging pores in wells or other subterranean formations; consolidating formations in wells or cementing a well or process of preparingExaminersPrimary: Suchfield, George A.Attorney, Agent or FirmInternational ClassesF21B 033/138F21B 043/22 F21B 043/24 AbstractA foam is provided having utility for improving sweep efficiency in subterranean oil-bearing formations and having specific utility for conformance improvement treatments and mobility control in such formations. The foam is a gel medium having a gas dispersed therein. The gel medium is made up of a crosslinkable polymer, a crosslinking agent, a surfactant and a liquid solvent.Field of SearchInjecting a composition to adjust the permeability (e.g., selective plugging)Injected fluid comprises water and material other than inorganic gas Organic material is resin or resinous Chemical inter-reaction of two or more introduced materials (e.g., selective plugging or surfactant) Producing foam or gas in well by foaming or gas producing material Cement or consolidating material is organic or has organic ingredient Composition for plugging pores in wells or other subterranean formations; consolidating formations in wells or cementing a well or process of preparing |
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