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.
E21B 27/04 - Containers for collecting or depositing substances in boreholes or wells, e.g. bailers for collecting mud or sandDrill bits with means for collecting substances, e.g. valve drill bits where the collecting or depositing means include helical conveying means
E21B 23/04 - Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells operated by fluid means, e.g. actuated by explosion
E21B 31/06 - Fishing for or freeing objects in boreholes or wells using magnetic means
E21B 23/01 - Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
E21B 37/04 - Scrapers specially adapted therefor operated by fluid pressure, e.g. free-piston scrapers
The present invention provides a milling tool (1) for a wellbore, comprising a milling section (2) and a metal cuttings removal section (3), the milling section (2) comprises radially arranged milling elements (4); and the metal cuttings removal section (3) has a first end (5) and a second end (6) and comprises a cylinder-shaped magnetic element (7), a rotation generating device (8) and a helix-shaped longitudinal guide element (9), wherein the first end (5) is connected to the milling section; the helix-shaped longitudinal guide element (9) is arranged around the cylinder-shaped magnetic element (7); the rotation generating device (8) is operably connected to the cylinder-shaped magnetic element (7) or the helix-shaped longitudinal guide element (9); wherein the cylinder-shaped magnetic element and the helix-shaped longitudinal guide element (9) are rotatable relative to each other around a common centreline (C), and configured such that metal cuttings accumulating on the cylinder-shaped magnetic element during use is guided by the helix-shaped longitudinal guide element towards the second end (6) of the metal cuttings removal section when the rotation generating device is operated.
E21B 29/00 - Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windowsDeforming of pipes in boreholes or wellsReconditioning of well casings while in the ground
E21B 33/13 - Methods or devices for cementing, for plugging holes, crevices or the like
The present invention provides a tool (1) for removing metal debris from a well bore, comprising a magnet element (2), rotation generating means (5), a debris removal unit (3) and a debris container (6), wherein the magnet element comprises a cylinder-shaped housing (10) having a first end (7) and a second end (8); the debris removal unit (3) comprises a first helix-shaped longitudinal guide element (4) arranged around the cylinder-shaped housing; the rotation generating means (5) are operably connected to the cylinder-shaped housing or the first helix-shaped longitudinal guide element; the debris container (6) comprises a first opening (9) arranged at the second end (8) of the cylinder-shaped housing, wherein the cylinder-shaped housing (10), or the first helix-shaped longitudinal guide element (4), is rotatable around its centerline (C), and configured such that metal debris accumulating on the cylinder-shaped housing during use is guided by the first helix-shaped longitudinal guide element towards the first opening (9) of the debris container when the rotation generating means are operated.
E21B 27/04 - Containers for collecting or depositing substances in boreholes or wells, e.g. bailers for collecting mud or sandDrill bits with means for collecting substances, e.g. valve drill bits where the collecting or depositing means include helical conveying means
E21B 37/00 - Methods or apparatus for cleaning boreholes or wells
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