Additive composition for release of stuck drill pipe
Patent 4427564 Issued on January 24, 1984. Estimated Expiration Date: 
September 30, 2002. 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.
September 30, 2002. 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 ReferencesLactone polyol esters as oleaginous additives Patent #: 4123373 InventorsAssigneeApplicationNo. 06/428825 filed on 09/30/1982US Classes:507/261, Organic component contains ether linkage (e.g., PEG ether, etc.)166/301, Freeing stuck object, grappling or fishing in well507/136, Organic component contains ether linkage (e.g., PEG ether, etc.)507/940FREEING STUCK OBJECT FROM WELLBOREExaminersPrimary: Guynn, Herbert B.Assistant: Kilby, Catherine S. Attorney, Agent or FirmInternational ClassC09K 8/02 (20060101)AbstractAn additive composition effective in the release of stuck pipe in a borehole during a drilling operation which composition contains a propoxylated lactone acid, e.g. a C8 -C22 alkyl lactone acids having from 10 to 13 propylene glycol units, an oil-soluble emulsifier-wetting agent and a liquid hydrocarbon diluent and for enhanced elevated temperature emulsion stability may include an imidazoline. |
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