Methods of using reverse circulating tool in a well borehole
Patent 5402850 Issued on April 4, 1995. Estimated Expiration Date: 
January 13, 2014. 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.
January 13, 2014. 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 3809161 Process for cleaning an oil field well bore hole using an internal casing wiper Reverse circulation tool handling cuttings and debris Perforation cleaning tools Patent #: 5228508 InventorsApplicationNo. 182793 filed on 01/13/1994US Classes:166/301, Freeing stuck object, grappling or fishing in well166/99, WITH JUNK RETRIEVING MEANS166/312Liquid introduced from well topExaminersPrimary: Neuder, William P.Attorney, Agent or FirmForeign Patent References
International ClassE21B 031/08AbstractA reverse circulation procedure is set forth in which selected shoes are attached to a reverse circulation tool. Debris, junk and other trash accumulating in a well borehole is captured and removed. The circulation delivers fluid flow in the annular space downwardly at the bottom of the tool of the present disclosure which is directed in the vicinity of a shoe affixed to the lower end. Trash or debris is captured by this process. In one instance, the trash is captured in an elongate container below the reverse circulation tool. In another instance, the trash is collected within the tool itself. The tool has a fluid flow path through an inner tube which is selectively perforated and which directs flow upwardly to one or more deflectors to assure that junk or trash does not flow through the tool. | |
