Method for altering flow profile of a subterranean formation during acid stimulation
Patent 5529122 Issued on June 25, 1996. Estimated Expiration Date: 
December 15, 2014. 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.
December 15, 2014. 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 3410344 3583483 3612179 3612182 Foamed acids stabilized with alkanols Highly stable alcohol foams and methods of forming and using such foams Oil recovery process Oil recovery composition Multipurpose aqueous foamer Process for improving the gas sweeping of an oil formation, using foams mainly containing surfactants with perfluoric groups InventorAssigneeApplicationNo. 356608 filed on 12/15/1994US Classes:166/281, Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking formation166/307, Attacking formation166/309, Producing foam or gas in well by foaming or gas producing material507/202, Contains intended gaseous phase at entry into wellbore507/205, Organic component contains fluorine bonded directly to carbon507/211, Carbohydrate is polysaccharide507/261Organic component contains ether linkage (e.g., PEG ether, etc.)ExaminersPrimary: Suchfield, George A.Attorney, Agent or FirmInternational ClassE21B 043/27AbstractA method for acidizing a subterranean formation wherein a specific foam is used to block flow through the higher-permeable zones of the formation while the acid is being injected therein. The foam is generated from a surfactant solution comprised of a blend of surfactants comprised of a nonionic primary surfactant (e.g. ethoxylated alcohol or polyglycosides) a cationic co-surfactant (e.g. fluorinated quaternary ammonium chloride). A polymer (e.g. polysaccharides or partially hydrolyzed polyacrylamide) may be added to the surfactant solution to enhance the foam mobility reduction and a co-solvent (e.g. polyol) may be added if necessary to maintain the surfactant/polymer complex in solution.Other References
Field of SearchSeparate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking formationCement or consolidating material is organic or has organic ingredient Attacking formation Producing foam or gas in well by foaming or gas producing material Contains intended gaseous phase at entry into wellbore Organic component contains fluorine bonded directly to carbon Carbohydrate is polysaccharide Organic component contains ether linkage (e.g., PEG ether, etc.) |
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