A well tool for removing metal debris from a well bore has a magnet element, an anti-torque anchor, a debris removal unit, a debris container and a first connecting end for a rotatable well string. The magnet element has a cylinder-shaped housing. The removal unit has a helix-shaped longitudinal guide element arranged on the housing. The anchor is connected to the housing or the guide element such that actuation of the anchor during use will prevent rotation of the housing or the guide element, respectively, relative the well-bore. The container has an opening at the end of the housing. The housing and the guide element are rotatable relative each other, and configured such that metal debris accumulating on the housing during use is guided by the guide element towards the opening of the container when the anchor is actuated and the first connecting end is rotated.

A method of removing a target fish from a wellbore includes preparing a fishing assembly having a magnetized pipe coupled to an end of a work string. The fishing assembly is run into the wellbore, and the magnetized pipe is positioned at an effective position in which a threaded end of the target fish is aligned with a threaded end of the magnetized pipe by magnetic attraction between the magnetized pipe and the target fish. A threaded connection is made up between the threaded end of the target fish and the threaded end of the magnetized pipe. The fishing assembly with the attached target fish is then retrieved from the wellbore to a surface location.

A method of removing a target fish from a wellbore includes preparing a fishing assembly having a magnetized pipe coupled to an end of a work string. The fishing assembly is run into the wellbore, and the magnetized pipe is positioned at an effective position in which a threaded end of the target fish is aligned with a threaded end of the magnetized pipe by magnetic attraction between the magnetized pipe and the target fish. A threaded connection is made up between the threaded end of the target fish and the threaded end of the magnetized pipe. The fishing assembly with the attached target fish is then retrieved from the wellbore to a surface location.

A tool for suspending in a well retrieves various metal debris from the well, and includes an elongated tool body with a plurality of magnets included in a plurality longitudinal ridges which are circumferentially spaced. In the method a plurality of magnets can be positioned within openings, recesses, or pockets in each ridge, and held in place by one or more retaining plates, the tool being connected to a drill string and lowered into a well.

A tool for suspending in a well retrieves various metal debris from the well, and includes an elongated tool body with a plurality of magnets included in a plurality longitudinal ridges which are circumferentially spaced. In the method a plurality of magnets can be positioned within openings, recesses, or pockets in each ridge, and held in place by one or more retaining plates, the tool being connected to a drill string and lowered into a well.

A magnet assembly for a debris collection tool includes first and second annular end bands, between which is disposed an annular arrangement of magnets. The magnet assembly includes a plurality of bridges, each bridge disposed between the first and second annular end bands and between circumferentially adjacent magnets of the annular arrangement of magnets. The first and second annular end bands are substantially of a non-magnetic material, and the bridges are substantially of a magnetic material.

A magnet assembly for a debris collection tool includes first and second annular end bands, between which is disposed an annular arrangement of magnets. The magnet assembly includes a plurality of bridges, each bridge disposed between the first and second annular end bands and between circumferentially adjacent magnets of the annular arrangement of magnets. The first and second annular end bands are substantially of a non-magnetic material, and the bridges are substantially of a magnetic material.

A well tool for removing metal debris from a well bore has a magnet element, an anti-torque anchor, a debris removal unit, a debris container and a first connecting end for a rotatable well string. The magnet element has a cylinder-shaped housing. The removal unit has a helix-shaped longitudinal guide element arranged on the housing. The anchor is connected to the housing or the guide element such that actuation of the anchor during use will prevent rotation of the housing or the guide element, respectively, relative the well-bore. The container has an opening at the end of the housing. The housing and the guide element are rotatable relative each other, and configured such that metal debris accumulating on the housing during use is guided by the guide element towards the opening of the container when the anchor is actuated and the first connecting end is rotated.

A well tool for removing metal debris from a well bore has a magnet element, an anti-torque anchor, a debris removal unit, a debris container and a first connecting end for a rotatable well string. The magnet element has a cylinder-shaped housing. The removal unit has a helix-shaped longitudinal guide element arranged on the housing. The anchor is connected to the housing or the guide element such that actuation of the anchor during use will prevent rotation of the housing or the guide element, respectively, relative the well-bore. The container has an opening at the end of the housing. The housing and the guide element are rotatable relative each other, and configured such that metal debris accumulating on the housing during use is guided by the guide element towards the opening of the container when the anchor is actuated and the first connecting end is rotated.

A wellbore cleanout magnet tool includes a housing and a door positioned within the housing. The housing is configured to be connected to a wellbore tubing. The housing defines an interior volume and an opening on a circumferential surface of the housing. The door is positioned within the housing. The door is configured to transition between an open position in an absence of wellbore fluid flow through the housing and a closed position in a presence of the wellbore fluid flow through the housing. A magnet is disposed in the interior volume. In the absence of the wellbore fluid flow through the housing, the door exposes the opening on the circumferential surface of the housing and the magnet to an environment outside the housing. In the presence of the wellbore fluid flow through the housing, the door closes the opening on the circumferential surface of the housing and isolates the magnet from the environment.