The Reverse Circulating Junk Basket is a junk retrieval tool designed to remove all types of small junk objects from the bottom of the well bore. This superior tool removes such items as slips, hand tools, bit cones, and any other small pieces of junk from the well. It uses reverse circulation to aid junk recovery. During operation, with the steel ball dropped into the valve seat, fluid flows through the inner passage of the barrel and out the vents in its lower end. The fluid is directed outward and downward and deflected toward the center. Fluid flows in a continuous stream to the center of the tool
and up through return ports in the upper end of the barrel. All junk is thus carried into the barrel above the junk catcher.
The tool consists of a top sub, barrel assembly, catcher, and shoe. A lifting sub is provided for ease of handling which includes a storage space for the steel ball used in the operation of the tool. It is converted into a fishing magnet by replacing the catcher with the MZS magnet insert.
Four types of shoes are available to fit the Reverse Circulating Junk Basket. Type A mill shoe is supplied as standard equipment with the cutting teeth dressed with crushed tungsten carbide and has side wings and can be used in softer formation.
Type B shoe is similar in design to the Type A shoe, however, it is hard faced with a sintered tungsten carbide in an extremely tough matrix. It is used for cutting into harder formations.
Type 'C' mill shoe is flat bottomed and dressed with crushed tungsten carbide on the inner bottom and outer faces and is used for cutting cores in hard formation or cutting metal.
Finger Type Shoes are expendable items and are used once only. They are used for retrieving loose junk lying in the bottom of the hole
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