Multi-axial antenna and method for use in downhole tools
First Claim
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1. A multi-axial antenna system with co-located coils comprising:
- a toroidal shaped bobbin comprising an electrically non-conductive material;
a first coil comprising opposite sections positioned around first opposite portions of the bobbin and through a central recess of the bobbin to generate a magnetic field in substantially a first direction when current flows through the first coil;
a second coil comprising opposite sections positioned around second opposite portions of the bobbin and through the central recess to generate a magnetic field in substantially a second direction when current flows through the second coil, the second direction being orthogonal to the first direction;
a third coil around the bobbin to generate a magnetic field in substantially a third direction when current flows through the third coil, the third direction being orthogonal to the first and second directions; and
signal generating circuitry to vary signals to the first, second, and third coils to generate a magnetic field vector that is angled with respect to the first, second, and third directions, to simulate a tilted coil.
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Abstract
Embodiments of a multi-axial antenna system and system for measuring subsurface formations are generally described herein. Other embodiments may be described and claimed. In some embodiments, the multi-axial antenna system comprising at least two co-located coils wound around a torroidal-shaped bobbin. Each coil generates a magnetic field in a mutually orthogonal direction. Signals provided to the coils may be adjusted to simulate a tilted-coil antenna system.
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Citations
29 Claims
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1. A multi-axial antenna system with co-located coils comprising:
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a toroidal shaped bobbin comprising an electrically non-conductive material; a first coil comprising opposite sections positioned around first opposite portions of the bobbin and through a central recess of the bobbin to generate a magnetic field in substantially a first direction when current flows through the first coil; a second coil comprising opposite sections positioned around second opposite portions of the bobbin and through the central recess to generate a magnetic field in substantially a second direction when current flows through the second coil, the second direction being orthogonal to the first direction; a third coil around the bobbin to generate a magnetic field in substantially a third direction when current flows through the third coil, the third direction being orthogonal to the first and second directions; and signal generating circuitry to vary signals to the first, second, and third coils to generate a magnetic field vector that is angled with respect to the first, second, and third directions, to simulate a tilted coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A subsurface measuring system for measuring subsurface formations comprising:
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an antenna system comprising first, second, and third co-located coils positioned around a toroidal-shaped bobbin; and signal generating circuitry to provide signals to the coils to generate magnetic fields in mutually orthogonal directions, wherein the toroidal-shaped bobbin comprises an electrically non-conductive material, wherein the first coil comprises opposite sections positioned around first opposite portions of the bobbin to generate a magnetic field in substantially a first direction, wherein the second coil comprises opposite sections positioned around second opposite portions of the bobbin to generate a magnetic field in substantially a second direction, and wherein the signal-generating circuitry varies the signals to the first, second, and third coils to generate a magnetic field vector that is angled to simulate a tilted coil. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification