Multipurpose fluid flow assisted downhole tool
Patent 4296822 Issued on October 27, 1981. Estimated Expiration Date: 
November 26, 1999. 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.
November 26, 1999. 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 2132014 2887347 2915127 3023810 3874465 Junk basket and method of removing foreign material from a well Patent #: 4059155 InventorAssigneeApplicationNo. 06/097496 filed on 11/26/1979US Classes:175/249, Core-retaining or severing means175/237, Means comprises dropped element175/255, Sliding wedge type (e.g., slips)175/328, Magnetized or with magnet175/403Core forming typeExaminersPrimary: Purser, Ernest R.Attorney, Agent or FirmInternational ClassesE21B 10/46 (20060101)E21B 10/48 (20060101) E21B 31/00 (20060101) E21B 21/10 (20060101) E21B 25/10 (20060101) E21B 25/12 (20060101) E21B 21/00 (20060101) E21B 31/06 (20060101) E21B 27/00 (20060101) E21B 25/00 (20060101) AbstractA multipurpose fluid flow assisted downhole tool that is adapted for attachment to the lower end of a pipe string to be extended into a well bore and which is capable of cutting sample cores from subsurface earth formations and removing the cores for evaluation. The tool is also capable of removing ferrous metal objects from the bottom of the well bore by both mechanical and magnetic means in conjunction with object movement assistance that is provided by flowing fluid in the vicinity of the bottom of the well bore. The well servicing tool includes an internal mechanism that has the capability of achieving reverse circulation of fluid in the vicinity of the bottom of the well bore which causes fluid flow from the annulus between the tool and the well bore, upwardly into an internal object collection chamber defined by the well tool and then outwardly of the well tool and upwardly through the annulus between the pipe string and the well bore to the surface. Ferrous objects are attracted by a magnet movably disposed within the object collection chamber and nonferrous objects are transported into the object collection chamber by flowing fluid and are retained therein by a plurality of object retainer fingers defining the bottom portion of the object collection chamber.Other References
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