Method of using a foamed fracturing fluid
Patent 5566760 Issued on October 22, 1996. Estimated Expiration Date: 
September 2, 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.
September 2, 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 3153450 3195634 3310112 3368627 3664422 Formation fracturing with stable foam Fracturing well formations using foam Crosslinked fracturing fluids Method for stimulation of wells with carbon dioxide or nitrogen based fluids containing high proppant concentrations Hydrophobically modified non-ionic polygalactomannan ethers InventorAssigneeApplicationNo. 300604 filed on 09/02/1994US Classes:166/308.6, Foam (EPO)166/309, Producing foam or gas in well by foaming or gas producing material507/202, Contains intended gaseous phase at entry into wellbore507/211, Carbohydrate is polysaccharide507/216, Hydroxyalkylcellulose (e.g., HEC, etc.)507/922FRACTURE FLUIDExaminersPrimary: Suchfield, George A.Attorney, Agent or FirmInternational ClassE21B 043/26AbstractAn aqueous foamed fracturing fluid composition and method for using the foamed fracturing fluid for fracturing subterranean formations that have been penetrated by a wellbore wherein the foamed fracturing fluid comprises: (a) a viscosifier which is preferably either hydrophobically modified guar or hydrophobically modified hydroxymethylcellulose; (b) a surfactant which is preferably alpha olefin sulfonate; and (c) the gas phase includes either nitrogen or carbon dioxide.Other References
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