Foaming and silt suspending agent
Patent 4113631 Issued on September 12, 1978. Estimated Expiration Date: 
August 10, 1996. 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 10, 1996. 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 2169976 2717876 3111178 3223647 3296145 3303896 3317430 3324183 3382924 Formation fracturing with stable foam InventorApplicationNo. 05/713168 filed on 08/10/1976US Classes:507/202, Contains intended gaseous phase at entry into wellbore166/307, Attacking formation507/240, Organic component is quaternary ammonium salt507/245, Organic component contains a nitrogen attached directly to oxygen by nonionic bonding (e.g., nitroaromatic, amineoxide, etc.)507/922, FRACTURE FLUID507/933ACIDIZING OR FORMATION DESTROYINGExaminersPrimary: Guynn, Herbert B.Attorney, Agent or FirmInternational ClassesC09K 8/60 (20060101)C09K 8/70 (20060101) C09K 8/38 (20060101) C09K 8/68 (20060101) C09K 8/02 (20060101) B01F 17/00 (20060101) AbstractA foaming and silt suspending agent is disclosed containing at least one alkyltrimethylammonium chloride and an amine oxide selected from the group consisting of bis-(2-hydroxyethyl) cocoamine oxide, dimethylhexadecylamine oxide, and dimethyl-hydrogenated tallowamine oxide. The agent is particularly useful in a variety of aqueous based fluids of the type used in treating subterranean formations, including fluids containing other cationic additives such as certain acid inhibitors and clay stabilization agents which tend to impair the effectiveness of prior art agents.Other References
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