Multi-axial antenna and method for use in downhole tools
First Claim
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1. A subsurface measuring system for measuring subsurface formations comprising:
- 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 first and second opposite coil sections positioned around first opposite portions of the bobbin to generate a magnetic field in substantially a first direction, the first and second coil sections being electrically coupled in parallel by first thru-wires that extend transversely through the first and second coil sections respectively and that are connected together to form a twisted pair, andwherein the second coil comprises third and fourth opposite coil sections positioned around second opposite portions of the bobbin to generate a magnetic field in substantially a second direction, the third and fourth opposite coil sections being electrically coupled in parallel by second thru-wires that extend transversely through the third and fourth coil sections respectively and that are connected together to form a twisted pair.
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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.
39 Citations
12 Claims
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1. 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 first and second opposite coil sections positioned around first opposite portions of the bobbin to generate a magnetic field in substantially a first direction, the first and second coil sections being electrically coupled in parallel by first thru-wires that extend transversely through the first and second coil sections respectively and that are connected together to form a twisted pair, and wherein the second coil comprises third and fourth opposite coil sections positioned around second opposite portions of the bobbin to generate a magnetic field in substantially a second direction, the third and fourth opposite coil sections being electrically coupled in parallel by second thru-wires that extend transversely through the third and fourth coil sections respectively and that are connected together to form a twisted pair. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. 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 coil sections positioned around first opposite portions of the bobbin to generate a magnetic field in substantially a first direction, the system further comprising first thru-wires that extend transversely through the first and second coil sections respectively, the first thru-wires forming a twisted pair that electrically couples the opposite coil sections of the first coil in parallel, wherein the second coil comprises opposite coil sections positioned around second opposite portions of the bobbin to generate a magnetic field in substantially a second direction, the system further comprising second thru-wires that extend transversely through the third and fourth coil sections respectively, the second thru-wires forming a twisted pair that electrically couples the opposite coil sections of the second coil in parallel, and wherein the bobbin includes a plurality of grooves to accept windings of the coils. - View Dependent Claims (9, 10, 11, 12)
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Specification