CONFIGURABLE MAGNET ASSEMBLY FOR USING IN NMR WELL LOGGING INSTRUMENT
First Claim
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1. A magnet assembly for measuring properties of a formation from a borehole, the magnet assembly comprising:
- a first device and a second device, each device adapted for insertion into the borehole, the first device producing a first magnetic field, the second device producing a second magnetic field;
wherein the second magnetic field is configurable for one of reinforcing and reducing the first magnetic field to produce a magnetic field used for the measuring; and
wherein the first device comprises a permanent magnet and the second device comprises at least one of one of a switchable magnet and switching windings.
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Abstract
A magnet assembly for measuring properties of a formation from a borehole, the magnet assembly including a first device and a second device, each device adapted for insertion into the borehole, the first device producing a first magnetic field, the second device producing a second magnetic field; wherein the second magnetic field is configurable for one of reinforcing and reducing the first magnetic field; and wherein the first device comprises a permanent magnet and the second device comprises at least one of one of a switchable magnet and switching windings.
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Citations
21 Claims
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1. A magnet assembly for measuring properties of a formation from a borehole, the magnet assembly comprising:
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a first device and a second device, each device adapted for insertion into the borehole, the first device producing a first magnetic field, the second device producing a second magnetic field; wherein the second magnetic field is configurable for one of reinforcing and reducing the first magnetic field to produce a magnetic field used for the measuring; and wherein the first device comprises a permanent magnet and the second device comprises at least one of one of a switchable magnet and switching windings. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for configuring a magnet assembly in a borehole, the method comprising:
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placing the assembly in the borehole; forming a substantially zero-dipole mode in the assembly for at least one of performing nuclear quadrapole resonance measurements and moving the magnetic assembly in the borehole without a substantial magnetic attraction to a magnetic casing; and forming a substantially fall-dipole mode in the assembly for performing nuclear magnetic resonance (NMR) measurements. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method for producing a magnet assembly, the assembly adapted for use in a borehole, the method comprising:
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selecting a permanent magnet; selecting at least one of switching windings and a switchable magnet; and combining the permanent magnet and at least one of the switching windings and the switchable magnet to form the assembly. - View Dependent Claims (20, 21)
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Specification