Composition and method for drilling formations containing geothermal fluid
Patent 4013568 Issued on March 22, 1977. Estimated Expiration Date: 
March 22, 1994. 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.
March 22, 1994. 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 2552775 2650197 2923681 3215200 3313362 3486560 3749554 InventorsAssigneeApplicationNo. 05/639652 filed on 12/11/1975US Classes:507/107, Humate component is fossilized (e.g., lignite, leonardite, brown coal, etc.)175/69, Combined liquid and gaseous fluid175/71, Gaseous fluid or under gas pressure507/119, Polymer derived from acrylic acid monomer or derivative507/120, Nitrogen is attached directly or indirectly to the acrylic acid monomer or derivative by nonionic bonding (e.g., acrylamide, acrylonitrile, etc.)507/910EARTH BORING FLUID DEVOID OF DISCRETE AQUEOUS PHASEExaminersPrimary: Guynn, Herbert B.Attorney, Agent or FirmAbstractA composition and method for drilling a well into a subterranean formation containing a geothermal fluid utilizing a gas-containing aqueous drilling fluid containing both lignite and a salt of a high molecular weight acrylic polymer. |
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