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Magnetic Fishing Tool with Alternative Flow Capability and Method

Inactive Publication Date: 2019-05-30
BAKER HUGHES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a magnetic fishing tool that has a valve member with a flow passage and magnets to remove debris from the fish. The valve member can be moved to direct fluid flow either above or below the fish, depending on the need. This allows for better visibility and easier removal of debris from the fish. The technical effect of this invention is to improve the fishing process by making it more efficient and effective in removing debris from the fish.

Problems solved by technology

One issue with the prior designs is that they either lacked a circulation path altogether or their circulation path was exclusively downwardly oriented toward the fish.

Method used

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  • Magnetic Fishing Tool with Alternative Flow Capability and Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0007]FIG. 1 shows a fishing tool body 10 having an upper connection thread 12 and a lower end open recess 14 in which resides at least one magnet 16. A passage 18 extends from thread 12 to recess 14. A sleeve 20 has a passage 22 and outer peripheral seals 24 against the body 10 in the passage 18. Flow entering passage 18 continues through passage 22 and out recess 14 past the magnet or magnets 16 when running in the hole toward the fish, not shown, that is to be retrieved. Also shown in FIG. 1 is a protective cover 26 with handles 28 that is removed before the body 10 is run in the hole on a variety of conveyances that are not shown. Such conveyances can be rigid or coiled tubing, for example, so that pressurized fluid can be delivered through passages 18 and 22 on the way to the fish.

[0008]During running in the lateral ports 30, three of which are visible in the section view of FIG. 1, are closed as they are located between seal assemblies 32 and 34. While the ports 30 are shown a...

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PUM

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Abstract

The magnetic fishing tool has an axial flow passage through a valve member and one or more magnets for initial dispersal of debris away from the fish. Once engaged to the fish the flow direction can be altered by moving the valve member to open lateral ports and to close the straight through path so that fluid circulates above the fish to clear debris from ahead of the fish on the trip out of the hole. This can be accomplished with an object landed on a seat in the valve member, which causes it to shift axially to expose the lateral ports. Optionally the valve member can be shifted with flow in which case the flow will continue axially as well as laterally for the retrieval of the fish.

Description

FIELD OF THE INVENTION[0001]The field of the invention is magnetic fishing tools and related methods and more particularly where the flow can be directed down to the fish and then redirected for circulation above the magnet during retrieval of the fish.BACKGROUND OF THE INVENTION[0002]At times magnetic objects need to be removed from a borehole in a process called fishing. These operations typically involve fluid movement for debris agitation around the object to be retrieved known as the fish. Magnets are used to bring a connection close to the fish with the hope of engaging the fish in a way that will allow it to be pulled out of the hole and retained for the trip up the hole to the surface. Other applications simply use magnets to capture debris loosened by cleaning devices. These designs are illustrated in U.S. Pat. No. 5,348,086; US20130000884; U.S. Pat. Nos. 8,689,877; 6,357,539 (FIG. 7); U.S. Pat. Nos. 6,629,562; 3,905,631 and 4,059,155.[0003]One issue with the prior designs ...

Claims

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Application Information

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IPC IPC(8): E21B34/10E21B31/06
CPCE21B34/10E21B31/06E21B31/03
Inventor ENGEVIK, THOR-HARALDJENSEN, RUNE
Owner BAKER HUGHES INC