Method of foam drilling using a sulfoacetate foaming agent
Patent 4036764 Issued on July 19, 1977. Estimated Expiration Date: 
July 19, 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.
July 19, 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 2166144 3463231 3486560 3572439 InventorsAssigneeApplicationNo. 05/621685 filed on 10/14/1975US Classes:507/135, Organic component contains a sulfur attached directly to carbon by nonionic bonding (e.g., sulfonate, etc.)175/69, Combined liquid and gaseous fluid175/71, Gaseous fluid or under gas pressure507/910EARTH BORING FLUID DEVOID OF DISCRETE AQUEOUS PHASEExaminersPrimary: Guynn, Herbert B.Attorney, Agent or FirmAbstractA method of conducting foam drilling and workover operations in a bore hole penetrating a subterranean formation, particularly a high-temperature formation such as a geothermal formation, employing an aqueous solution of a foaming agent having the formula: ##STR1## wherein R is a straight chain alkyl radical having from 10 to 16 carton atoms; and M is an alkali metal or ammoniun cation, with sodium being preferred. A particularly preferred foaming agent is sodium lauryl sulfoacetate. |
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