초록 ▼

A tool for retrieving metal objects from a wellbore has a plurality of magnet assemblies spaced longitudinally along a tool body. Each magnet assembly has a plurality of magnet members, which can be arcuate or longitudinal, covering a majority surface area of the tool body. In the embodiment of the

A tool for retrieving metal objects from a wellbore has a plurality of magnet assemblies spaced longitudinally along a tool body. Each magnet assembly has a plurality of magnet members, which can be arcuate or longitudinal, covering a majority surface area of the tool body. In the embodiment of the invention having longitudinal members, magnet protectors are secured immediately adjacent to a corresponding magnet member for deflecting striking force of the metal particles being attracted to the magnet during rotation of the tool. A trap space if formed between the magnet and an adjacent magnet protector for retaining more metal particles within the magnet assemblies.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method of retrieving metal particles from a well bore, comprising the following steps:providing a tool body having a central opening therein;providing a plurality of magnet assemblies longitudinally spaced along said tool body, each magnet assembly comprising a plural

[ What is claimed is:] [1.]1. A method of retrieving metal particles from a well bore, comprising the following steps:providing a tool body having a central opening therein;providing a plurality of magnet assemblies longitudinally spaced along said tool body, each magnet assembly comprising a plurality of magnet members, said magnet members covering a majority surface area of said tool body, exterior surfaces of said magnet members defining metal particles settling area;detachably non-rotatable securing each of said magnet members on said tool body;lowering said body into the well bore and imparting rotation to said tool body, thereby creating a magnetic field and causing metal particles to settle on said magnet assemblies;providing a magnet protector for each of said magnet members for deflecting a striking force of said metal particles on said magnet members; andforming one side of each of said magnet protectors with a length greater than a corresponding side of the immediately adjacent magnet member to thereby protect the immediately adjacent magnet member from striking force of metal particles being attracted by the magnet member.