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1. WO2006102622 - MAGNETIC TOOL FOR RETRIEVING METAL OBJECTS FROM A WELL BORE WHEN USING COIL TUBING

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[ EN ]

AMENDED CLAIMS
received by the International Bureau on 29 August 2006 (29.08.2006)

Claims:
1. An apparatus for retrieving metal objects from a wellbore, comprising:
a cylindrical tool body with a central opening therethrough; and
a plurality of spaced-apart magnet assemblies configured for positioning in a surrounding relationship over at least a portion of said tool body, said magnet assemblies defining a primary settling area for the metal objects, each of said magnet assemblies comprising a magnet member encased in a sleeve mounted in contact with a respective magnet member; and
at least one tubular spacer mounted between adjacent magnet assemblies in a surrounding relationship over the tool body, said spacer member defining a secondary settling area for the metal objects between respective upper and lower edges of adjoining magnet assemblies.
2. The apparatus of Claim 1, wherein each of said magnet assemblies has a generally ring-shaped cross-section,
3. The apparatus of Claim 1 , wherein said sleeve is configured to follow exterior configuration of a respective magnet member.
4. The apparatus of Claim 3, wherein said sleeve comprises a generally cylindrical main portion and opposing end portions having a generally frustoconical configuration.

5. The apparatus of Claim 2, wherein each of said magnet assemblies comprises a plurality of elongated magnet members circumferentially disposed about the tool body and extending in a generally parallel relationship to a central axis of the tool body, said magnet members forming an open center polygon in cross section,

6. The apparatus of Claim 1 , wherein said at least one spacer has a generally tubular configuration.
7. The apparatus of Claim 6, wherein said at least one spacer comprises a plurality of elongated plates disposed in a circumferential relationship about said tool body and extending in a generally parallel relationship to a central axis of the tool body, said plates forming an open center polygon in cross section.
8. The apparatus of Claim 6, wherein an external diameter of said spacer is smaller than an external diameter of each of said magnet assemblies.
9. The apparatus of Claim 1 , wherein each of said magnet assemblies and said spacer is detachably mounted on said tool body.
10. The apparatus of claim 1 , wherein said tool body is provided with an upper connector located above said magnet assemblies and a lower connector located below said magnet assemblies, said upper connector and said lower connector allowing connection of said tool body to a drill string lowered into the well bore.
11. An apparatus for retrieving metal objects from a wellbore, comprising:
a cylindrical tool body with a central opening therethrough; and
at least a pair of spaced-apart magnet assemblies configured for positioning in a surrounding relationship over at least a portion of said tool body, said magnet assemblies defining a primary settling area for the metal objects, each of said magnet assemblies comprising a magnet member encased in a sleeve mounted in contact with a respective magnet member; and at least one tubular spacer mounted between said magnet assemblies in a surrounding relationship to said tool body, said spacer member defining a secondary settling area for the metal objects.
12. The apparatus of Claim 11 , wherein an external diameter of said spacer member is smaller than an external diameter of each of said magnet assemblies.
13. The apparatus of Claim 11, wherein said sleeve is configured to follow exterior configuration of a respective magnet member.
14. The apparatus of Claim 13, wherein said sleeve is formed from a non-corrosive material.
15. The apparatus of Claim 13, wherein said sleeve comprises a generally cylindrical main portion and opposing end portions having a generally frustoconical configuration.

16. The apparatus of Claim 11 , wherein each of said magnet assemblies and said spacer is detachably mounted on said tool body.
17. An apparatus for retrieving metal objects from a wellbore, comprising:
a cylindrical tool body with a central opening therethrough; and
at least a pair of spaced-apart magnet assemblies configured for positioning in a surrounding relationship over at least a portion of said tool body, said magnet assemblies defining a primary settling area for the metal objects, each of said magnet assemblies comprising a plurality of elongated magnet members secured in a surrounding
relationship over at least a portion of said tool body and extending in a generally parallel relationship to a central axis of the tool body, each of the magnet members being encased in a sleeve mounted in contact with a respective magnet member; and at least one tubular spacer mounted between said magnet assemblies in a surrounding relationship to said tool body, said spacer member defining a secondary settling area for the metal objects.
18. The apparatus of Claim 17, wherein said at least one spacer comprises a plurality of elongated plates disposed in a circumferential relationship about said tool body and extending in a generally parallel relationship to a central axis of the tool body.