Antenna structures for electromagnetic well logging tools
First Claim
Patent Images
1. An antenna for an electromagnetic well logging tool, comprising:
- a core, the core including a substantially cylindrical outer surface, the outer surface having channels and pins adapted to retain a first electrical conductor in a predetermined pattern, the first electrical conductor disposed in the channels;
the predetermined pattern adapted to cause the antenna to have a first magnetic dipole moment substantially perpendicular to a longitudinal axis of the core.
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Abstract
The invention refers to antenna configurations for electromagnetic logging tools. The antennas have one or more electrical conductors disposed on a dielectric substrate wrapped around a core or disposed directly on the core. The conductor or conductors are arranged such that the antenna has a first magnetic dipole moment substantially perpendicular to a longitudinal axis of the core. The invention also refers to antennas adapted for mutual balancing using interleaved conductive paths or disks to alter the magnetic dipole moments to mutually balance the antenna system.
102 Citations
69 Claims
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1. An antenna for an electromagnetic well logging tool, comprising:
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a core, the core including a substantially cylindrical outer surface, the outer surface having channels and pins adapted to retain a first electrical conductor in a predetermined pattern, the first electrical conductor disposed in the channels;
the predetermined pattern adapted to cause the antenna to have a first magnetic dipole moment substantially perpendicular to a longitudinal axis of the core. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An antenna for an electromagnetic logging tool, comprising:
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a core formed of a dielectric material;
an electrical conductor disposed on a dielectric substrate, the substrate wrapped around the core and the conductor disposed such that the antenna has a first magnetic dipole moment substantially perpendicular to a longitudinal axis of the core. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An antenna for an electromagnetic logging tool, comprising:
a core, having a substantially cylindrical outer surface, the outer surface having channels and pins adapted to retain electrical conductors in a predetermined pattern, the predetermined pattern adapted to cause first and second electrical conductors to have a first and second magnetic dipole moment substantially perpendicular to a longitudinal axis of the core, the first and second electrical conductors disposed in the channels and adapted to have the second magnetic dipole moment pointing in a different direction from the first magnetic moment. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. An antenna for an electromagnetic logging tool, comprising:
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a core;
an electrical conductor disposed on a dielectric substrate, the substrate wrapped around the core, the conductor forming first and second conductive paths, the first and second conductive paths arranged to have a first and second magnetic dipole moment substantially perpendicular to a longitudinal axis of the core, the first and second magnetic dipole moments pointing in different directions. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. A well togging tool comprising:
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a support having at least one antenna mounted thereon; and
processing circuitry electrically coupled to the at least one antenna, wherein the at least one antenna comprises a core having a substantially cylindrical outer surface, the outer surface having channels and pins adapted to retain at least one electrical conductor in a predetermined pattern, the predetermined pattern arranged such that first and second electrical conductors disposed in the channels have a first and second magnetic dipole moment substantially perpendicular to a longitudinal axis of the core, the first magnetic dipole moment pointing in a direction different from the second magnetic dipole moment. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
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57. A well logging tool comprising:
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a support having at least one antenna mounted thereon; and
processing circuitry electrically coupled to the at least one antenna, wherein the at least one antenna comprises a dielectric substrate wrapped around a core, the substrate having an electrical conductor disposed thereon, the conductor forming first and second conductive paths, the first and second conductive paths arranged to have a first and second magnetic dipole moment substantially perpendicular to a longitudinal axis of the core, the first and second magnetic moments pointing in different directions. - View Dependent Claims (58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69)
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Specification