Polymer enhanced foam drilling fluid
December 27, 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 3630286 3738437 Composition and method for drilling formations containing geothermal fluid Composition and method for drilling a reservoir containing a high temperature aqueous liquid Composition and method for drilling high temperature reservoirs Stabilized aqueous foam systems and concentrate and method for making them Enhanced liquid hydrocarbon recovery process Polymer enhanced foams for reducing gas coning Polymer enhanced foam for treating gas override or gas channeling Oil recovery process utilizing a supercritical carbon dioxide emulsion InventorAssigneeApplicationNo. 364588 filed on 12/27/1994US Classes:175/69, Combined liquid and gaseous fluid175/65, Boring with specific fluid507/102, Contains intended gaseous phase at entry into wellbore507/120, Nitrogen is attached directly or indirectly to the acrylic acid monomer or derivative by nonionic bonding (e.g., acrylamide, acrylonitrile, etc.)507/134, Organic component contains sulfur attached directly or indirectly to carbon by nonionic bonding507/135, Organic component contains a sulfur attached directly to carbon by nonionic bonding (e.g., sulfonate, etc.)507/136Organic component contains ether linkage (e.g., PEG ether, etc.)ExaminersPrimary: Suchfield, George A.Attorney, Agent or FirmForeign Patent References
International ClassesE21B 021/00C09K 007/02 C09K 007/08 AbstractA process employing a polymer enhanced foam in a wellbore as a drilling fluid during a wellbore drilling operation. The polymer enhanced foam is formed from an uncrosslinked acrylamide polymer, a surfactant, an aqueous solvent, and an added gas.Other References
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