US20110284210A1 - Dual-Pole Magnetic Attraction Downhole Magnetic Retrieval Apparatus - Google Patents
Dual-Pole Magnetic Attraction Downhole Magnetic Retrieval Apparatus Download PDFInfo
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- US20110284210A1 US20110284210A1 US12/782,207 US78220710A US2011284210A1 US 20110284210 A1 US20110284210 A1 US 20110284210A1 US 78220710 A US78220710 A US 78220710A US 2011284210 A1 US2011284210 A1 US 2011284210A1
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- Prior art keywords
- tool
- insert
- magnet
- disposed
- fin
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/06—Fishing for or freeing objects in boreholes or wells using magnetic means
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
Definitions
- the invention relates generally to systems and methods for cleaning the interior of tubular members.
- the invention relates to methods and devices for removing metallic debris from tubular members using magnets.
- the invention relates to magnetic retrieval devices that externally present both north and south poles of magnets for removal of metallic debris.
- Metallic debris accumulates within wellbores and other tubular members during production of subterranean fluids, such as hydrocarbon fluids. This metallic debris typically includes tiny metal shavings and cuttings. These shavings and cuttings result from numerous frictional operations that might occur within the wellbore or tubular, including the cutting of sidetracking windows, milling, drilling through of stuck devices and objects, as well as general operations that cause metal-to-metal scraping to occur.
- a retrieval apparatus includes a tool mandrel with insert pockets.
- the tool mandrel preferably includes a central collar with keyed openings.
- the retrieval apparatus preferably includes a plurality of removable, modular inserts which reside within the insert pockets of the tool mandrel. Spacers also preferably surround the tool mandrel and help to retain the inserts in place.
- the tool also preferably carries stabilizers to help centralize the inserts within a surrounding tubular.
- the bodies of the modular inserts each contain one or more individual magnets.
- the insert bodies also present an interior radial surface and an outer radial surface.
- the outer radial surface faces a wellbore or surrounding tubular when the insert is installed within a magnet pocket.
- the inner radial surface faces the tool mandrel when the insert is so installed.
- a removable cover may be disposed onto the interior radial surface of each insert to retain magnets within cavities within the insert body.
- the inserts of the magnetic retrieval tool each preferably provide one or more longitudinal, axially extending fins which project radially outwardly from a base portion.
- the fins are separated from one another by recesses within which metallic debris is captured upon being attracted by the magnets within the fins of the inserts.
- both magnetic poles of the magnetic elements within the insert body are available to attract metallic debris.
- FIG. 1 is a side, external view of an exemplary magnetic retrieval tool constructed in accordance with the present invention.
- FIG. 2 is a side, cross-sectional view of the tool depicted in FIG. 1 .
- FIG. 3 is an external isometric view of the tool depicted in FIGS. 1-2 .
- FIG. 4 is an axial cross-sectional view taken along lines 4 - 4 in FIG. 2 .
- FIG. 5 is an isometric view of an exemplary insert used in the tool shown in FIGS. 1-4 , illustrating features of the exterior radial surface of the insert.
- FIG. 6 is an isometric view of the insert shown in FIG. 5 , depicting features of the interior radial surface of the insert.
- FIG. 7 is a further isometric view of the interior radial surface of the insert shown in FIGS. 5-6 , now with an interior cover in place.
- FIG. 8 is an enlarged side, cross-sectional view of portions of the tool shown in FIGS. 1-3 .
- FIG. 8A is an enlarged side, cross-sectional view of an alternative embodiment of a tool constructed in accordance with the present invention.
- FIG. 9 is an axial cross-section taken along lines 9 - 9 in FIG. 2 .
- FIG. 10 is an external, cross-sectional view of an alternative embodiment for a tool constructed in accordance with the present invention wherein magnets are retained within longitudinal slots in inserts surrounding the central mandrel.
- FIG. 11 is a side, cross-sectional view of portions of the exemplary tool shown in FIG. 10 .
- FIG. 12 is an external, isometric view of a radially-interior surface of an alternative exemplary insert in accordance with the present invention.
- FIG. 13 is an external, isometric view of the insert shown in FIG. 12 , now with magnets and retaining strips inserted.
- FIG. 14 is an axial cross-section of the insert shown in FIG. 13 .
- FIGS. 1-8 and 9 illustrate a first exemplary magnetic retrieval tool 10 that is constructed in accordance with the present invention.
- the tool 10 includes a cylindrical tool mandrel 12 which defines a central flowbore 14 (see FIG. 2 ) along its length.
- the tool mandrel 12 is provided with threaded connections 16 at its axial ends to permit the tool 10 to be incorporated into a downhole work string.
- the tool mandrel 12 presents an outer radial surface 18 with a plurality of recessed pockets 20 formed therewithin. In the depicted embodiment, there are four pockets 20 . Each of the pockets 20 is preferably axially elongated and arcuately curved, as shown in FIG. 3 , wherein an empty pocket 20 is shown. In the depicted embodiment, each pocket 20 is located on the opposite side of the mandrel 12 from another pocket 20 . In this embodiment, the pockets 20 provide an essentially semi-circular opening.
- the tool mandrel 12 also presents a radially-enlarged collar 22 which projects radially outwardly from a reduced diameter portion 23 of the tool mandrel 12 and includes keyed openings 24 (see FIG. 3 ).
- the exemplary magnetic retrieval tool 10 also includes a plurality of removable inserts 26 that reside within the pockets 20 in a complimentary manner.
- An exemplary insert 26 is depicted in FIGS. 5-7 apart from the other components of the tool 10 .
- the insert 26 presents an outer radial surface 28 having a plurality of axially-oriented, outwardly-projecting fins 30 which are separated by recesses 32 .
- One axial end of the insert 26 includes an arcuately curved engagement portion 34 (see FIG. 5 ).
- the other axial end of the insert 26 presents a plurality of keys 36 which extend axially outwardly from the main body of the insert 26 .
- the keys 36 are shaped and sized to reside within the keyed openings 24 of the collar 22 (see FIG. 9 ).
- the keys 36 and openings 24 may be made in many different shapes so long as they are complimentary to one another.
- FIGS. 6 and 7 depict the interior radial portions of the insert 26 .
- the interior radial portion of the insert 26 is provided with a removable cover 38 .
- the cover 38 is shown in place in FIG. 7 while FIG. 6 shows the insert 26 with the cover 38 removed.
- FIG. 6 illustrates that the interior radial surface 40 of the insert 26 has a plurality of magnet-retaining cavities 42 into which removable magnets 44 (see, e.g., FIG. 8 ) reside.
- the cavities 42 and magnets 44 are each located within one of the fins 30 .
- the exemplary magnets 44 have an elongated body having a generally rectangular cross-section.
- each insert 26 retains its respective multiple magnets 44 in a fixed array or matrix surrounding the mandrel 12 . Further, the array of magnets 44 can be readily affixed to or removed from a surrounding relation to the mandrel 12 .
- the cover 38 is slid into place by disposing tapered tabs 39 on the cover 38 into grooves 41 on the insert 26 .
- the cover 38 will retain the magnets 44 within the cavities 42 of the insert 26 .
- the cover 38 preferably isolates the magnets 44 magnetically from the mandrel 12 .
- the inserts 26 themselves and covers 38 are preferably not made of magnetic material.
- the magnets 44 that are retained within the inserts 26 provide the magnetic force used to remove metallic debris from a wellbore or other tubular member.
- a non-magnetic cover 38 is disposed in between the mandrel 12 and each magnet 44 , the magnets 44 are substantially isolated magnetically from the mandrel 12 , thereby making the inserts 26 substantially easier to remove from the mandrel 12 .
- the magnets 44 are located within the fins 30 of the inserts 26 when installed.
- the fins 20 provide a structural protective housing for the individual magnets 44 .
- Location of the magnets 44 within the fins 30 of the inserts 26 also provides for an enlarged magnetized surface area on the outer radial surface 28 of the magnetic inserts 26 .
- FIG. 4 illustrates that the magnets 44 present lateral north (N) and south (S) poles which provide magnetic attraction on both lateral sides 43 of the fins 30 .
- One lateral side 43 of each fin 30 provides a first attraction surface, which uses the north magnetic poles of the magnets 44 to attract debris, while the other lateral side 43 provides a second magnetic attraction surface which uses the south magnetic pole of the magnets 44 to attract metallic debris.
- the recesses 32 provide protected chambers to prevent magnetically-attracted debris from being dislodged when the tool 10 is being removed from a surrounding wellbore or other tubular.
- the tool mandrel 12 also defines a pair exterior fluid flowpaths 46 (see FIGS. 3 and 4 ). If, during operation, the recesses 32 become filled with debris, fluid within a surrounding wellbore can still flow past the tool 10 via the flowpaths 46 .
- the magnetic retrieval tool 10 includes stabilizers 47 , 48 that radially surround the tool mandrel 12 and are used to centralize the magnetic bars 26 of the tool 10 within a surrounding tubular during operation.
- Each of the stabilizers 47 , 48 are rotatable with respect to the tool mandrel 12 .
- the stabilizers 47 , 48 are formed of mating semi-cylindrical halves that are assembled around the outer circumference of the tool mandrel 12 .
- FIG. 8 depicts in detail one exemplary method of securing the stabilizer 47 around the tool mandrel 12 .
- Construction of the stabilizer 48 mirrors this.
- Split bearing races 50 radially surround the tool mandrel 12 .
- Roller bearings 52 are disposed between the split bearing races 50 and a surrounding split roller sleeve 54 so that the split roller sleeve 54 can rotate easily with respect to the tool mandrel 12 .
- a stabilizer sleeve 56 radially surrounds the split roller sleeve 54 and will rotate about the tool mandrel 12 with the split roller sleeve 54 .
- FIG. 8 a depicts an alternative tool 10 ′ which has been constructed in accordance with the present invention.
- the tool 10 ′ is constructed in the same manner as the tool 10 , previously described, except where indicated.
- Roller bearings 52 and ball bearings 53 are disposed between the bearing race 50 ′ and the surrounding stabilizer sleeve 47 a.
- spacers 59 lie adjacent inserts 26 to maintain engagement between keys 36 and keyed openings 24 of collar 22 .
- retaining ring 58 slides over spacers 59 and lies adjacent the roller sleeve 54 .
- retaining ring 58 slides over spacers 59 and lies adjacent the stabilizer 47 a .
- the interior radial surface 60 of the retaining ring 58 contacts the engagement portion 34 of the adjacent inserts 26 , thereby retaining the inserts 26 within their respective pockets 20 .
- the keys 36 of the inserts 26 are disposed within the keyed openings 24 of the collar 22 .
- the inserts 26 are disposed within their respective pockets 20 as this is done.
- spacers 59 are installed in pockets 20 , and retaining ring 58 is slid onto each axial end of the tool mandrel 12 and in surrounding contact with the engagement portions 34 of the bars 26 .
- the stabilizers 47 , 48 are installed onto the tool mandrel 12 .
- FIGS. 10 and 11 illustrate an alternative design for an insert 100 which could be used with the tool 10 in accordance with the present invention.
- the insert 100 retains a plurality of rectangular, non-magnetic magnet tubes 102 .
- Magnets 44 are installed through the opening 108 at either end of the magnet tube 102 .
- Magnets 44 form a fixed array or matrix surrounding the mandrel 12 .
- Magnets 44 may be square, rectangular, round, or of other geometric shapes.
- the inserts 100 each have a plurality of longitudinal slots 104 formed within.
- the slots 104 each have an internal opening 106 .
- the slots 104 are each shaped and sized to receive one magnet tube 102 .
- Multiple magnets 44 are disposed within magnet tube 102 in a side-by-side relation.
- both north and south magnetic poles of the magnets 102 are able to provide magnetic attraction on both lateral sides 43 of magnetic tube 102 and its respective fin 30 .
- Metallic debris that is attracted by the magnets 44 will be captured within the recesses 32 between the magnet tubes 102 .
- the ends of slot 104 prevent magnets 44 from coming out of openings 108 at the end of the magnet tubes 102 .
- Spacer 59 and retaining ring 58 retain insert 100 in recessed pockets 20 of mandrel 12 .
- FIGS. 12-14 depict a further alternative exemplary magnetic retrieval tool insert 110 for retaining a plurality of magnets in a fixed array or matrix about the central mandrel 12 .
- the insert 110 has a curved elongated body 112 that is shaped and sized to removably reside within a pocket, such as pocket 20 on tool mandrel 12 .
- the body 112 presents a radial interior surface 114 within which is formed a one or more longitudinal channels 116 .
- Retaining slots 118 are also disposed within the body 112 and are located within the channels 116 . The slots 118 protrude deeper into the body 112 than the channels 116 and, as illustrated in FIG. 14 , largely extend into the fins 30 of the body 112 .
- FIGS. 13 and 14 depict the insert 110 assembled with magnets 120 (one shown in FIG. 14 ) and retaining strips, or members, 122 .
- the magnets 120 are each shaped and sized to reside in a complimentary fashion within one of the slots 118 .
- the retaining strips 122 are then disposed within the channels 116 , as shown in FIGS. 13 and 14 to retain the magnets 120 within the slots 118 .
- an interference fit is provided between the retaining strips 122 and the channels 116 .
- the retaining strips 122 are preferably formed of non-magnetic material and thereby serve to magnetically isolate the magnets 120 from the mandrel 12 to some degree. It is noted that retaining strips or members might be in the form of strips of rubber O-ring material, of a type known in the art.
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Abstract
A magnetic retrieval tool used for collecting metallic debris and material from within a wellbore or other surrounding downhole tubular. The tool includes a tool mandrel with a removable insert which contains one or more magnets. The insert is formed such that both the north and south magnetic poles of the one or more magnets are able to attract metallic debris.
Description
- 1. Field of the Invention
- The invention relates generally to systems and methods for cleaning the interior of tubular members. In particular aspects, the invention relates to methods and devices for removing metallic debris from tubular members using magnets. In other particular aspects, the invention relates to magnetic retrieval devices that externally present both north and south poles of magnets for removal of metallic debris.
- 2. Description of the Related Art
- Metallic debris accumulates within wellbores and other tubular members during production of subterranean fluids, such as hydrocarbon fluids. This metallic debris typically includes tiny metal shavings and cuttings. These shavings and cuttings result from numerous frictional operations that might occur within the wellbore or tubular, including the cutting of sidetracking windows, milling, drilling through of stuck devices and objects, as well as general operations that cause metal-to-metal scraping to occur.
- Devices used for the removal of metallic debris by magnets are described, for example, in U.S. Pat. No. 7,515,299, U.S. Pat. No. 7,219,724 and U.S. Pat. No. 7,137,449.
- The invention provides magnetic retrieval tools for use in a wellbore or other tubular member to remove metallic debris. In preferred embodiments, a retrieval apparatus includes a tool mandrel with insert pockets. In addition, the tool mandrel preferably includes a central collar with keyed openings. The retrieval apparatus preferably includes a plurality of removable, modular inserts which reside within the insert pockets of the tool mandrel. Spacers also preferably surround the tool mandrel and help to retain the inserts in place. The tool also preferably carries stabilizers to help centralize the inserts within a surrounding tubular.
- The bodies of the modular inserts each contain one or more individual magnets. The insert bodies also present an interior radial surface and an outer radial surface. The outer radial surface faces a wellbore or surrounding tubular when the insert is installed within a magnet pocket. The inner radial surface faces the tool mandrel when the insert is so installed. A removable cover may be disposed onto the interior radial surface of each insert to retain magnets within cavities within the insert body.
- The inserts of the magnetic retrieval tool each preferably provide one or more longitudinal, axially extending fins which project radially outwardly from a base portion. The fins are separated from one another by recesses within which metallic debris is captured upon being attracted by the magnets within the fins of the inserts. In this embodiment, both magnetic poles of the magnetic elements within the insert body are available to attract metallic debris.
- The advantages and further aspects of the invention will be readily appreciated by those of ordinary skill in the art as the same becomes better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings in which like reference characters designate like or similar elements throughout the several figures of the drawing and wherein:
-
FIG. 1 is a side, external view of an exemplary magnetic retrieval tool constructed in accordance with the present invention. -
FIG. 2 is a side, cross-sectional view of the tool depicted inFIG. 1 . -
FIG. 3 is an external isometric view of the tool depicted inFIGS. 1-2 . -
FIG. 4 is an axial cross-sectional view taken along lines 4-4 inFIG. 2 . -
FIG. 5 is an isometric view of an exemplary insert used in the tool shown inFIGS. 1-4 , illustrating features of the exterior radial surface of the insert. -
FIG. 6 is an isometric view of the insert shown inFIG. 5 , depicting features of the interior radial surface of the insert. -
FIG. 7 is a further isometric view of the interior radial surface of the insert shown inFIGS. 5-6 , now with an interior cover in place. -
FIG. 8 is an enlarged side, cross-sectional view of portions of the tool shown inFIGS. 1-3 . -
FIG. 8A is an enlarged side, cross-sectional view of an alternative embodiment of a tool constructed in accordance with the present invention. -
FIG. 9 is an axial cross-section taken along lines 9-9 inFIG. 2 . -
FIG. 10 is an external, cross-sectional view of an alternative embodiment for a tool constructed in accordance with the present invention wherein magnets are retained within longitudinal slots in inserts surrounding the central mandrel. -
FIG. 11 is a side, cross-sectional view of portions of the exemplary tool shown inFIG. 10 . -
FIG. 12 is an external, isometric view of a radially-interior surface of an alternative exemplary insert in accordance with the present invention. -
FIG. 13 is an external, isometric view of the insert shown inFIG. 12 , now with magnets and retaining strips inserted. -
FIG. 14 is an axial cross-section of the insert shown inFIG. 13 . -
FIGS. 1-8 and 9 illustrate a first exemplarymagnetic retrieval tool 10 that is constructed in accordance with the present invention. Thetool 10 includes acylindrical tool mandrel 12 which defines a central flowbore 14 (seeFIG. 2 ) along its length. Thetool mandrel 12 is provided with threadedconnections 16 at its axial ends to permit thetool 10 to be incorporated into a downhole work string. - The
tool mandrel 12 presents an outerradial surface 18 with a plurality of recessedpockets 20 formed therewithin. In the depicted embodiment, there are fourpockets 20. Each of thepockets 20 is preferably axially elongated and arcuately curved, as shown inFIG. 3 , wherein anempty pocket 20 is shown. In the depicted embodiment, eachpocket 20 is located on the opposite side of themandrel 12 fromanother pocket 20. In this embodiment, thepockets 20 provide an essentially semi-circular opening. Thetool mandrel 12 also presents a radially-enlargedcollar 22 which projects radially outwardly from a reduceddiameter portion 23 of thetool mandrel 12 and includes keyed openings 24 (seeFIG. 3 ). - The exemplary
magnetic retrieval tool 10 also includes a plurality ofremovable inserts 26 that reside within thepockets 20 in a complimentary manner. Anexemplary insert 26 is depicted inFIGS. 5-7 apart from the other components of thetool 10. Theinsert 26 presents an outerradial surface 28 having a plurality of axially-oriented, outwardly-projectingfins 30 which are separated byrecesses 32. One axial end of theinsert 26 includes an arcuately curved engagement portion 34 (seeFIG. 5 ). The other axial end of theinsert 26 presents a plurality ofkeys 36 which extend axially outwardly from the main body of theinsert 26. Thekeys 36 are shaped and sized to reside within thekeyed openings 24 of the collar 22 (seeFIG. 9 ). Those of skill in the art will understand that thekeys 36 andopenings 24 may be made in many different shapes so long as they are complimentary to one another. -
FIGS. 6 and 7 depict the interior radial portions of theinsert 26. The interior radial portion of theinsert 26 is provided with aremovable cover 38. Thecover 38 is shown in place inFIG. 7 whileFIG. 6 shows theinsert 26 with thecover 38 removed.FIG. 6 illustrates that the interiorradial surface 40 of theinsert 26 has a plurality of magnet-retainingcavities 42 into which removable magnets 44 (see, e.g.,FIG. 8 ) reside. As can be seen inFIG. 4 , thecavities 42 andmagnets 44 are each located within one of thefins 30. Theexemplary magnets 44 have an elongated body having a generally rectangular cross-section. However, themagnets 44 may have other suitable cross-sectional shapes or configurations, including round, oval, triangular, or irregular. It can be appreciated that each insert 26 retains its respectivemultiple magnets 44 in a fixed array or matrix surrounding themandrel 12. Further, the array ofmagnets 44 can be readily affixed to or removed from a surrounding relation to themandrel 12. - Once the
magnets 44 are placed within thecavities 42, thecover 38 is slid into place by disposing taperedtabs 39 on thecover 38 intogrooves 41 on theinsert 26. Thecover 38 will retain themagnets 44 within thecavities 42 of theinsert 26. In addition, thecover 38 preferably isolates themagnets 44 magnetically from themandrel 12. It is noted that theinserts 26 themselves and covers 38 are preferably not made of magnetic material. However, themagnets 44 that are retained within theinserts 26 provide the magnetic force used to remove metallic debris from a wellbore or other tubular member. Because anon-magnetic cover 38 is disposed in between themandrel 12 and eachmagnet 44, themagnets 44 are substantially isolated magnetically from themandrel 12, thereby making theinserts 26 substantially easier to remove from themandrel 12. - As
FIG. 4 shows, themagnets 44 are located within thefins 30 of theinserts 26 when installed. Thefins 20 provide a structural protective housing for theindividual magnets 44. Location of themagnets 44 within thefins 30 of theinserts 26 also provides for an enlarged magnetized surface area on the outerradial surface 28 of the magnetic inserts 26.FIG. 4 illustrates that themagnets 44 present lateral north (N) and south (S) poles which provide magnetic attraction on bothlateral sides 43 of thefins 30. Onelateral side 43 of eachfin 30 provides a first attraction surface, which uses the north magnetic poles of themagnets 44 to attract debris, while the otherlateral side 43 provides a second magnetic attraction surface which uses the south magnetic pole of themagnets 44 to attract metallic debris. Metallic debris that is attracted by themagnets 44 will be captured within therecesses 32 between thefins 30. Therecesses 32 provide protected chambers to prevent magnetically-attracted debris from being dislodged when thetool 10 is being removed from a surrounding wellbore or other tubular. - Preferably, the
tool mandrel 12 also defines a pair exterior fluid flowpaths 46 (seeFIGS. 3 and 4 ). If, during operation, therecesses 32 become filled with debris, fluid within a surrounding wellbore can still flow past thetool 10 via theflowpaths 46. - It is further preferred that the
magnetic retrieval tool 10 includesstabilizers tool mandrel 12 and are used to centralize themagnetic bars 26 of thetool 10 within a surrounding tubular during operation. Each of thestabilizers tool mandrel 12. In a currently preferred embodiment, thestabilizers tool mandrel 12. -
FIG. 8 depicts in detail one exemplary method of securing thestabilizer 47 around thetool mandrel 12. Construction of thestabilizer 48 mirrors this. Split bearing races 50 radially surround thetool mandrel 12.Roller bearings 52 are disposed between thesplit bearing races 50 and a surroundingsplit roller sleeve 54 so that thesplit roller sleeve 54 can rotate easily with respect to thetool mandrel 12. Astabilizer sleeve 56 radially surrounds thesplit roller sleeve 54 and will rotate about thetool mandrel 12 with thesplit roller sleeve 54. -
FIG. 8 a depicts analternative tool 10′ which has been constructed in accordance with the present invention. Thetool 10′ is constructed in the same manner as thetool 10, previously described, except where indicated. In thetool 10′, there is asingle bearing race 50′ disposed around thetool mandrel 12 for thestabilizer 47 a.Roller bearings 52 andball bearings 53 are disposed between the bearingrace 50′ and the surroundingstabilizer sleeve 47 a. - It is noted that in both the
tool 10 inFIG. 8 and thetool 10′, shown inFIG. 8A , spacers 59 lieadjacent inserts 26 to maintain engagement betweenkeys 36 and keyedopenings 24 ofcollar 22. Intool 10 inFIG. 8 , retainingring 58 slides overspacers 59 and lies adjacent theroller sleeve 54. InFIG. 8A retaining ring 58 slides overspacers 59 and lies adjacent thestabilizer 47 a. The interiorradial surface 60 of the retainingring 58 contacts theengagement portion 34 of theadjacent inserts 26, thereby retaining theinserts 26 within theirrespective pockets 20. In order to assemble thetool 10, thekeys 36 of theinserts 26 are disposed within thekeyed openings 24 of thecollar 22. Theinserts 26 are disposed within theirrespective pockets 20 as this is done. Thereafter, spacers 59 are installed inpockets 20, and retainingring 58 is slid onto each axial end of thetool mandrel 12 and in surrounding contact with theengagement portions 34 of thebars 26. Then, thestabilizers tool mandrel 12. -
FIGS. 10 and 11 illustrate an alternative design for aninsert 100 which could be used with thetool 10 in accordance with the present invention. Theinsert 100 retains a plurality of rectangular,non-magnetic magnet tubes 102.Magnets 44 are installed through theopening 108 at either end of themagnet tube 102.Magnets 44 form a fixed array or matrix surrounding themandrel 12.Magnets 44 may be square, rectangular, round, or of other geometric shapes. In this embodiment, theinserts 100 each have a plurality oflongitudinal slots 104 formed within. Theslots 104 each have aninternal opening 106. Theslots 104 are each shaped and sized to receive onemagnet tube 102.Multiple magnets 44 are disposed withinmagnet tube 102 in a side-by-side relation. As a result, both north and south magnetic poles of themagnets 102 are able to provide magnetic attraction on bothlateral sides 43 ofmagnetic tube 102 and itsrespective fin 30. Metallic debris that is attracted by themagnets 44 will be captured within therecesses 32 between themagnet tubes 102. Oncemagnet tube 102 is installed inslot 104, the ends ofslot 104 preventmagnets 44 from coming out ofopenings 108 at the end of themagnet tubes 102.Spacer 59 and retainingring 58retain insert 100 in recessedpockets 20 ofmandrel 12. -
FIGS. 12-14 depict a further alternative exemplary magneticretrieval tool insert 110 for retaining a plurality of magnets in a fixed array or matrix about thecentral mandrel 12. AsFIG. 12 shows, theinsert 110 has a curvedelongated body 112 that is shaped and sized to removably reside within a pocket, such aspocket 20 ontool mandrel 12. Thebody 112 presents a radialinterior surface 114 within which is formed a one or morelongitudinal channels 116. In the embodiment shown inFIGS. 12-14 , there are threechannels 116. Retainingslots 118 are also disposed within thebody 112 and are located within thechannels 116. Theslots 118 protrude deeper into thebody 112 than thechannels 116 and, as illustrated inFIG. 14 , largely extend into thefins 30 of thebody 112. -
FIGS. 13 and 14 depict theinsert 110 assembled with magnets 120 (one shown inFIG. 14 ) and retaining strips, or members, 122. Themagnets 120 are each shaped and sized to reside in a complimentary fashion within one of theslots 118. The retaining strips 122 are then disposed within thechannels 116, as shown inFIGS. 13 and 14 to retain themagnets 120 within theslots 118. Preferably, an interference fit is provided between the retainingstrips 122 and thechannels 116. The retaining strips 122 are preferably formed of non-magnetic material and thereby serve to magnetically isolate themagnets 120 from themandrel 12 to some degree. It is noted that retaining strips or members might be in the form of strips of rubber O-ring material, of a type known in the art. - The foregoing description is directed to particular embodiments of the present invention for the purpose of illustration and explanation. It will be apparent, however, to one skilled in the art that many modifications and changes to the embodiment set forth above are possible without departing from the scope and the spirit of the invention.
Claims (22)
1. A magnetic retrieval tool for collecting metallic material from a surrounding tubular, the tool comprising:
a tool mandrel;
a magnet with north and south magnetic poles disposed upon the tool mandrel; and
wherein the tool presents a first outer attraction surface to attract metallic debris using the north magnetic pole of the magnet and a second outer attraction surface to attract metallic debris using the south magnetic pole of the magnet.
2. The tool of claim 1 wherein the tool further comprises:
an outer radial surface having at least one outwardly radially-projecting fin having two lateral sides;
the magnet is located inside of the fin; and
the first outer attraction surface is located on one lateral side and the second outer attraction surface is located on the other lateral side.
3. The tool of claim 2 wherein the outer radial surface comprises a plurality of outwardly radially-projecting fins having two lateral sides;
a magnet is disposed within each of said fins; and wherein
a radially exterior recess is disposed between each two of said plurality of fins for collection of metallic debris.
4. The tool of claim 3 wherein at least one magnet disposed within a fin comprises a non-magnetic tube containing a plurality of magnets.
5. The tool of claim 2 further comprising:
an insert disposed upon the tool mandrel, the fin being defined upon the insert; and
wherein the magnet is disposed within a magnet-retaining cavity that is located at least partially within the fin.
6. The tool of claim 5 wherein the insert is substantially formed of non-magnetic material.
7. The tool of claim 5 further comprising a cover that is removably attached to an inner radial surface of the insert to retain the magnet within the cavity.
8. A magnetic retrieval tool for collecting metallic material from a surrounding tubular, the tool comprising:
a tool mandrel;
an insert disposed upon the tool mandrel, the insert containing a magnet with north and south magnetic poles; and
wherein the insert presents a first outer attraction surface to attract metallic debris using the north magnetic pole of the magnet and a second outer attraction surface to attract metallic debris using the south magnetic pole of the magnet.
9. The tool of claim 8 wherein the insert further comprises:
an outer radial surface having at least one outwardly radially-projecting fin having two lateral sides;
the magnet is located inside of the fin; and
the first outer attraction surface is located on one lateral side and the second outer attraction surface is located on the other lateral side.
10. The tool of claim 9 wherein:
the outer radial surface comprises a plurality of outwardly radially-projecting fins having two lateral sides; and
a magnet is located inside of each fin.
11. The tool of claim 10 wherein a radially exterior recess is disposed between each two of said plurality of fins for collection of metallic debris.
12. The tool of claim 8 wherein the insert is substantially formed of non-magnetic material.
13. The tool of claim 8 wherein the magnet is disposed within a magnet-retaining cavity that is located at least partially within the fin.
14. The tool of claim 13 further comprising a cover that is removably attached to an inner radial surface of the insert to retain the magnet within the cavity.
15. The tool of claim 8 wherein the tool mandrel includes an exterior fluid flowpath defined upon an outer radial surface to permit fluid in a surrounding tubular to flow past the tool.
16. An insert for use with a magnetic retrieval tool, the insert comprising:
an insert body that is shaped and sized to removably reside within a complimentary pocket on a tool mandrel;
the insert body containing a magnet with north and south magnetic poles; and
the insert body presenting a first outer attraction surface to attract metallic debris using the north magnetic pole of the magnet and a second outer attraction surface to attract metallic debris using the south magnetic pole of the magnet.
17. The insert of claim 16 further comprising:
an outer radial surface having at least one outwardly radially-projecting fin having two lateral sides;
the magnet is located inside of the fin; and
the first outer attraction surface is located on one lateral side and the second outer attraction surface is located on the other lateral side.
18. The insert of claim 17 wherein the outer radial surface comprises a plurality of outwardly radially-projecting fins having two lateral sides;
a magnet is disposed within each of said fins; and wherein
a radially exterior recess is disposed between each two of said plurality of fins for collection of metallic debris.
19. The insert of claim 18 wherein a radially exterior recess is disposed between each two of said plurality of fins for collection of metallic debris.
20. The insert of claim 16 wherein the insert body is substantially formed of non-magnetic material.
21. The insert of claim 17 wherein the magnet is disposed within a magnet-retaining cavity that is located at least partially within the fin.
22. The insert of claim 21 further comprising a cover that is removably attached to an inner radial surface of the insert to retain the magnet within the cavity.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/782,207 US20110284210A1 (en) | 2010-05-18 | 2010-05-18 | Dual-Pole Magnetic Attraction Downhole Magnetic Retrieval Apparatus |
US12/794,354 US8678091B2 (en) | 2010-05-18 | 2010-06-04 | Magnetic retrieval apparatus and method for retaining magnets on a downhole magnetic retrieval apparatus |
PCT/US2011/035451 WO2011146251A1 (en) | 2010-05-18 | 2011-05-06 | Dual-pole magnetic attraction downhole magnetic retrieval apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/782,207 US20110284210A1 (en) | 2010-05-18 | 2010-05-18 | Dual-Pole Magnetic Attraction Downhole Magnetic Retrieval Apparatus |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/794,354 Continuation-In-Part US8678091B2 (en) | 2010-05-18 | 2010-06-04 | Magnetic retrieval apparatus and method for retaining magnets on a downhole magnetic retrieval apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110284210A1 true US20110284210A1 (en) | 2011-11-24 |
Family
ID=44971486
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/782,207 Abandoned US20110284210A1 (en) | 2010-05-18 | 2010-05-18 | Dual-Pole Magnetic Attraction Downhole Magnetic Retrieval Apparatus |
Country Status (2)
Country | Link |
---|---|
US (1) | US20110284210A1 (en) |
WO (1) | WO2011146251A1 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140299380A1 (en) * | 2011-09-07 | 2014-10-09 | Krzysztof Machocki | Drill string tubular component |
US9422781B1 (en) * | 2014-10-23 | 2016-08-23 | Lone Star Magnetics, LLC | Magnetic tool and method |
CN107448161A (en) * | 2017-08-23 | 2017-12-08 | 中国石油天然气股份有限公司 | Strong magnetic die and its magnetic block method for arranging |
US10208553B2 (en) | 2013-11-05 | 2019-02-19 | Weatherford Technology Holdings, Llc | Magnetic retrieval apparatus |
US10240417B2 (en) * | 2015-03-31 | 2019-03-26 | Norse Oiltools As | Well tool |
US11371315B2 (en) * | 2017-09-01 | 2022-06-28 | Swarfix As | Milling tool |
US11414946B2 (en) * | 2018-06-13 | 2022-08-16 | Schlumberger Technology Corporation | Systems and methods for removing and collecting magnetic debris from drilling fluid |
US11480032B2 (en) * | 2020-03-02 | 2022-10-25 | Weatherford Technology Holdings, Llc | Debris collection tool |
US11566482B2 (en) | 2018-09-17 | 2023-01-31 | Swarfix As | Well tool |
Families Citing this family (1)
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CN110886582A (en) * | 2019-12-26 | 2020-03-17 | 合力(天津)能源科技股份有限公司 | Integrated drilling tool for crushing and cleaning drilling well debris deposit bed |
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AR047734A1 (en) * | 2004-08-31 | 2006-02-15 | Rattler Tools Inc | MAGNETIC TOOL FOR RECOVERING METAL OBJECTS FROM A WELL OF DRILLING |
US7357183B2 (en) * | 2005-09-09 | 2008-04-15 | Venturi Oil Tools | Magnetic fishing tool and method |
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US2415730A (en) * | 1942-02-20 | 1947-02-11 | Hartford Nat Bank & Trust Co | Magnetic cleaning device |
US5461746A (en) * | 1995-01-17 | 1995-10-31 | Tdw Delaware, Inc. | Magnetic cleaning pig |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140299380A1 (en) * | 2011-09-07 | 2014-10-09 | Krzysztof Machocki | Drill string tubular component |
US9493998B2 (en) * | 2011-09-07 | 2016-11-15 | Oilsco Technologies Limited | Drill string tubular component |
US10208553B2 (en) | 2013-11-05 | 2019-02-19 | Weatherford Technology Holdings, Llc | Magnetic retrieval apparatus |
US9422781B1 (en) * | 2014-10-23 | 2016-08-23 | Lone Star Magnetics, LLC | Magnetic tool and method |
US10240417B2 (en) * | 2015-03-31 | 2019-03-26 | Norse Oiltools As | Well tool |
CN107448161A (en) * | 2017-08-23 | 2017-12-08 | 中国石油天然气股份有限公司 | Strong magnetic die and its magnetic block method for arranging |
US11371315B2 (en) * | 2017-09-01 | 2022-06-28 | Swarfix As | Milling tool |
US11414946B2 (en) * | 2018-06-13 | 2022-08-16 | Schlumberger Technology Corporation | Systems and methods for removing and collecting magnetic debris from drilling fluid |
US11566482B2 (en) | 2018-09-17 | 2023-01-31 | Swarfix As | Well tool |
US11480032B2 (en) * | 2020-03-02 | 2022-10-25 | Weatherford Technology Holdings, Llc | Debris collection tool |
Also Published As
Publication number | Publication date |
---|---|
WO2011146251A1 (en) | 2011-11-24 |
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