Patent ID: 6491117
Filing Date: 2002-12-10
Classification: E21B

Abstract:
An apparatus for retrieving metal debris from a wellbore, comprising:a cylindrical tool body with a central opening therethrough; a plurality of sets of magnet assemblies spaced longitudinally along the length of the tool body, each set comprising a plurality of magnet assemblies spaced circumferentially about the outer circumference of the tool body, said magnet assemblies each having an exterior surface defining primary debris settling area, each of said sets of magnet assemblies comprising an elongated magnet member spaced longitudinally from a magnet member of another set of magnet assemblies secured on the tool body in a non-coaxial relationship to each other, each of said magnet assemblies comprising a magnet liner, each magnet liner being secured within a recess formed in said tool body, and wherein each of said magnet members is fitted in said magnet liner; a magnet protector formed immediately adjacent to each of the magnet assemblies and extending outwardly from said tool body; and a plurality of secondary debris settling areas, each secondary debris settling area being defined by the tool body in locations between a magnet assembly and a magnet protector of an adjacent magnet assembly.