Foamed gel employed as a drilling fluid, a lost circulation fluid, or a combined drilling/lost circulation fluid
November 8, 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 ReferencesMethod for controlling permeability of subterranean formations Method of treating subterranean formations utilizing foamed viscous fluids Polymeric well treating method Gel and process for preventing loss of circulation, and combination process for enhanced recovery Aqueous drilling and packer fluids Conformance improvement in a subterranean hydrocarbon-bearing formation using a polymer gel Polymers for use as filtration control aids in drilling muds Oil base drilling fluid composition Lost circulation fluid for oil field drilling operations Foam for improving sweep efficiency in subterranean oil-bearing formations InventorAssigneeApplicationNo. 336150 filed on 11/08/1994US Classes:166/295, Organic material is resin or resinous166/309, Producing foam or gas in well by foaming or gas producing material175/69, Combined liquid and gaseous fluid175/72, Prevention of lost circulation or caving507/102, 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.)507/903CROSSLINKED RESIN OR POLYMERExaminersPrimary: Suchfield, George A.Attorney, Agent or FirmForeign Patent References
International ClassesE21B 021/00E21B 033/138 AbstractA process employing a foamed gel in a wellbore as a drilling fluid, lost circulation fluid, or combined drilling/lost circulation fluid during the wellbore drilling operation. The foamed gel is formed from a crosslinkable carboxylate-containing polymer, a crosslinking agent containing a reactive transition metal cation, a surfactant, an aqueous solvent, and an added gas.Other References
Field of SearchContains intended gaseous phase at entry into wellboreNitrogen is attached directly or indirectly to the acrylic acid monomer or derivative by nonionic bonding (e.g., acrylamide, acrylonitrile, etc.) CROSSLINKED RESIN OR POLYMER Cement or consolidating material is organic or has organic ingredient Organic material is resin or resinous Producing foam or gas in well by foaming or gas producing material Combined liquid and gaseous fluid Boring with specific fluid Prevention of lost circulation or caving |
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