Downhole magnetic retrieval apparatus
AssigneeBaker Hughes Incorporated
InventorsAtle Johnny Sorhus, Larry Thomas Palmer
Life of this patent
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Abstract
A tool for removal of magnetic debris from a well bore, having a plurality of magnets retained in a plurality of recesses by a plurality of retainer caps which are threadable into the recesses. The retainer caps can be made of non-magnetic material, and non-magnetic spacers can be used, to isolate the magnets from the tool body and the surroundings. The retainer caps can be positioned entirely within the recesses, to streamline the tool body. The magnets can be removed from the recesses and replaced.
Claims17
An apparatus for retrieval of downhole debris, comprising:
- a tool body adapted for attachment to a work string;
- a plurality of recesses formed in an outer surface of said tool body;
- a plurality of magnets, each said magnet being positionable in one of said plurality of recesses;
- and
- a plurality of retainer caps, each said retainer cap being mountable in one of said plurality of recesses, each said retainer cap being configured to retain one of said plurality of magnets in one of said plurality of recesses.
An apparatus for retrieval of downhole debris, comprising:
- a tool body adapted for attachment to a work string;
- a plurality of recesses formed in an outer surface of said tool body;
- a plurality of magnets, each said magnet being positionable in one of said plurality of recesses;
- a plurality of retainer caps, each said retainer cap being mountable in one of said plurality of recesses, each said retainer cap being configured to retain one of said plurality of magnets in one of said plurality of recesses;
- and
- a removable drive member on each said retainer cap, said retainer cap being configured to fit entirely within one of said plurality of recesses in said lateral outer surface, after removal of said drive member;
- wherein:
- a plurality of said recesses are formed in a lateral outer surface of said tool body;
- and
- each said retainer cap is entirely contained within one of said plurality of recesses in said lateral outer surface.
An apparatus for retrieval of downhole debris, comprising:
- a tool body adapted for attachment to a work string;
- a plurality of recesses formed in an outer surface of said tool body;
- a plurality of magnets, each said magnet being positionable in one of said plurality of recesses;
- a plurality of retainer caps, each said retainer cap being mountable in one of said plurality of recesses, each said retainer cap being configured to retain one of said plurality of magnets in one of said plurality of recesses;
- and
- a plurality of non-magnetic spacers, each said non-magnetic spacer being positionable under one of said plurality of magnets in one of said plurality of recesses.
An apparatus for retrieval of downhole debris, comprising:
- a tool body adapted for attachment to a work string;
- a plurality of recesses in a lateral outside surface of said tool body;
- a plurality of magnets, each said magnet being positionable in one of said plurality of recesses;
- a plurality of non-magnetic spacers, each said non-magnetic spacer being positionable under one of said plurality of magnets in one of said plurality of recesses;
- and
- a plurality of non-magnetic retainer caps, each said retainer cap being threadable into one of said plurality of recesses, each said retainer cap being configured to retain one of said plurality of magnets in one of said plurality of recesses;
- wherein each said retainer cap is adapted to be entirely contained within one of said plurality of recesses.
Dependencies are inferred from the claim text.