The reverse circulation junk basket is used to catch small fish, such as drilling bit cones, cutter blades, hand tool etc. During operation, with the steel ball dropped into the valve seat, fluid flow in a continuous stream to the center of the tool and up through return ports in the upper end of the barrel above the junk catcher.

Technical specifications and parameters

The drilling mud can produce reverse circulation locally at the bottom of a well. It is easy for fishing. Moreover, it can be used as a special coring tool.