Reverse circulation tool handling cuttings and debris

Details Reverse circulation tool handling cuttings and debris Reverse circulation tool handling cuttings and debris

1991-03-20

1993-01-05

Melius, Terry Lee

Wells

With junk retrieving means

166162, 175312, E21B 3108

Patent

active

051762080

ABSTRACT:
A 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.

REFERENCES:
patent: 2894725 (1959-07-01), Baker
patent: 3023810 (1962-03-01), Anderson
patent: 3120872 (1964-02-01), Anderson
patent: 3198256 (1965-08-01), Kirby, III
Drilling (Exposition In Print), "New Drill Removes Plugs And Packers Without Rotary Rig", Baker Sand Line Drill, May 15, 1964, p. 89.

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