Downhole debris catcher and associated mill
Patent 7610957 Issued on November 3, 2009. Estimated Expiration Date: 
February 11, 2028. 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.
February 11, 2028. 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 2169922 2220989 2556849 2659441 Method and apparatus for removing debris from a wellbore Junk bailer apparatus for use in retrieving debris from a well bore of an oil and gas well Wellborne mills & methods Downhole cutting separator High volume sand trap and method Apparatus for catching debris in a well-bore InventorsAssigneeApplicationNo. 12029228 filed on 02/11/2008US Classes:166/99WITH JUNK RETRIEVING MEANSExaminersPrimary: Gay, Jennifer HAssistant: Ro, Yong-Suk Attorney, Agent or FirmInternational ClassesE21B 31/08E21B 27/00 E21B 34/00 AbstractA debris catching device for downhole milling features modular debris receptacles that are held in the housing in a manner that facilitates stacking and a generally undulating flow path to facilitate dropping of the debris into the receptacles as the remaining fluid travels up the tool for ultimate screening before the fluid exits the tool to flow up to the surface or in a reverse circulation pattern back to the mill below the debris catcher. The modules can also be aligned with flapper valves at the top of each module to prevent debris in the tool from falling to the mill if circulation is turned off. The mill is configured to have an off-center return path preferably as large as the passage through the mill body to aid circulation and cutting performance.Other References
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