Magnetic retrieval apparatus
AssigneeWeatherford Technology Holdings, LLC
InventorsMichael K. Sullivan, Arthur Warren Meeks
Life of this patent
Estimating the term…
Abstract
A downhole retrieval tool includes a mandrel; an inner sleeve disposed around the mandrel; a plurality of magnets coupled to the inner sleeve; and an outer sleeve disposed around the plurality of magnets, wherein the inner sleeve and the plurality of magnets are rotatable relative to the mandrel. In another aspect, an assembly tool for handling a magnet includes an anchor; a conveyance movable relative to the anchor; and a magnet holder coupled to the conveyance, wherein the magnet holder includes an arm for retaining the magnet.
Claims23
A downhole retrieval tool, comprising:
- a mandrel having a longitudinal axis extending from a first end of the mandrel to a second end of the mandrel;
- an inner sleeve disposed around the mandrel;
- a plurality of magnets coupled to the inner sleeve;
- and
- an outer sleeve disposed around the plurality of magnets, wherein the inner sleeve and the plurality of magnets are rotatable relative to the mandrel, and wherein the outer sleeve includes a plurality of outer sleeve valleys that extend into a corresponding plurality of valleys between two adjacent magnets, wherein two adjacent outer sleeve valleys are circumferentially spaced relative to one another about the outer sleeve, the plurality of outer sleeve valleys extending along the longitudinal axis from the first end of the mandrel to the second end of the mandrel.
A downhole retrieval tool, comprising:
- a mandrel having a longitudinal axis extending from a first end of the mandrel to a second end of the mandrel;
- an inner sleeve disposed around the mandrel;
- a plurality of magnetic columns coupled to the inner sleeve;
- the plurality of magnetic columns having a plurality of magnets, wherein the plurality of magnetic columns are circumferentially spaced around the inner sleeve;
- and
- an outer sleeve disposed around the plurality of magnetic columns, wherein the inner sleeve and the plurality of magnetic columns are rotatable relative to the mandrel, and wherein the outer sleeve includes a plurality of outer sleeve valleys that extend into and aligned with a corresponding plurality of valleys between two adjacent magnetic columns, the plurality of outer sleeve valleys extending along the longitudinal axis from the first end of the mandrel to the second end of the mandrel.
A downhole retrieval tool, comprising:
- a mandrel having a longitudinal axis extending from a first end of the mandrel to a second end of the mandrel;
- an inner sleeve disposed around the mandrel;
- a plurality of magnetic columns having a first end and a second end coupled to the inner sleeve, each magnetic column extending in a direction of the longitudinal axis from the first end to the second end, each of the plurality of magnetic columns having a plurality of magnets;
- and
- an outer sleeve disposed around the plurality of magnetic columns, wherein the inner sleeve and the plurality of magnetic columns are rotatable relative to the mandrel, and wherein the outer sleeve includes a plurality of outer sleeve valleys that extend into a corresponding plurality of valleys between two adjacent magnetic columns, wherein the plurality of outer sleeve valleys and the corresponding plurality of valleys between two adjacent magnetic columns both extend in the direction of the longitudinal axis.
Dependencies are inferred from the claim text.