Low fluid loss foam
Patent 4217231 Issued on August 12, 1980. Estimated Expiration Date: 
August 14, 1998. 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.
August 14, 1998. 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 ReferencesInventorAssigneeApplicationNo. 05/933371 filed on 08/14/1978US Classes:507/202, Contains intended gaseous phase at entry into wellbore166/282, Specific low fluid loss feature for fluid attacking formation166/283, Specific low fluid loss feature for fracturing fluid or cement causes fracture507/203, Contains organic component507/215, Carboxyalkylcellulose (e.g., CMC, CMHEC, etc.)507/216, Hydroxyalkylcellulose (e.g., HEC, etc.)507/260, Organic component is polycarboxylic acid, ester, or salt thereof507/266, Organic component contains an alcohol group507/267, Organic component contains carboxylic acid, ester, or salt thereof507/922FRACTURE FLUIDExaminersPrimary: Guynn, Herbert B.Attorney, Agent or FirmInternational ClassesC09K 8/60 (20060101)C09K 8/94 (20060101) AbstractAn improved method for reducing fluid loss during high pressure hydraulic fracturing of well formations using an aqueous foam involving adding to the foam from about 0.0005 to 0.5% by weight of an additive selected from the group consisting of a C5 to C10 unsubstituted monocarboxylic aliphatic acid, a C5 to C10 unsubstituted aliphatic alcohol, malonic acid, lower n-alkyl diesters of malonic acid and their mixtures. The new additives are shown to be as effective in reducing fluid loss during fracturing as the commercial practice employing hydroxy ethyl cellulose at a fraction of the cost of hydroxy ethyl cellulose without depositing polymer within the formation.Other References
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