Means for collecting unwanted material in an oil or gas well
Patent 5682950 Issued on November 4, 1997. Estimated Expiration Date: 
November 22, 2015. 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 22, 2015. 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 1472213 1656526 2169922 2890756 3520359 Dual string packer mill Reverse circulation tool handling cuttings and debris Patent #: 5176208 InventorAssigneeApplicationNo. 561982 filed on 11/22/1995US Classes:166/99, WITH JUNK RETRIEVING MEANS175/312Sieve or strainerExaminersPrimary: Neuder, William P.Attorney, Agent or FirmForeign Patent References
International ClassD21B 031/16Foreign Application Priority Data1994-11-25 NOAbstractMeans for collecting and bringing up unwanted material from an oil or gas well, the means thereby comprising a grinder or mill (6) and a coating (8) of a wear resistant material along its front and outer surfaces, the mill (6) being secured to a throughgoing drilling pipe having an inner centric liquid channel (7), the axially leading facing end of the mill (6) comprising a channel (4) extending through the mill (6) and into a junk chamber (3) behind or after the mill (6), the upper end of the means comprising a strainer (2) allowing penetration of liquid, but restraining the material, the rotation of the means from the throughgoing drilling pipe thereby ensuring that junk is brought into the channel (4) and from here into the junk chamber (3). | |
