Reverse circulation tool handling cuttings and debris
Patent 5176208 Issued on January 5, 1993. Estimated Expiration Date: 
March 20, 2011. 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.
March 20, 2011. 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 2894725 3023810 3120872 3198256 InventorsAssigneeApplicationNo. 673230 filed on 03/20/1991US Classes:166/99, WITH JUNK RETRIEVING MEANS166/162, RECEPTACLES175/312Sieve or strainerExaminersPrimary: Melius, Terry LeeAttorney, Agent or FirmForeign Patent References
International ClassE21B 031/08AbstractA device for providing fluid cross over in a milling operation is set forth. It is particularly used by connection to a pipe string which supports the milling device for cutting junk from a well. It features an elongate hollow tool body having a central portion which defines a trash receiving chamber. There is a pipe inserted into this chamber from below for introducing return fluid after cutting which is laden with metal shavings, chips, and trash. In this chamber, fluid flows upwardly through the pipe, and trash collects in the chamber by surrounding the pipe falling to the bottom of the chamber by weight. The chamber is limited at the top end by transverse wall which has a number of perforations having an aggregate cross sectional area to prevent fluid flow restriction. Fluid flow cross over is accomplished whereby new fluid is introduced through the pipe string, flows to the exterior below a rubber pack off, flushes the cuttings downwardly and away from the milling device, and returns the fluid up through the tool where trash in the fluid is captured.Other References
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