Inductive cavity sensors for resistivity tools
First Claim
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1. An apparatus comprising:
- a conductive tool body comprising;
a first transmitter comprising;
a first transmitter annular cavity that encircles the conductive tool body,a first transmitter surface gap that encircles the conductive tool body and electromagnetically couples the first transmitter annular cavity to an external surface of the conductive tool body, anda first transmitter ring of high magnetic permeability material in the first transmitter annular cavity;
a first receiver comprising;
a first receiver annular cavity,a first receiver surface gap that electromagnetically couples the external surface of the conductive tool body to the first receiver annular cavity, anda first high magnetic permeability material in the first receiver annular cavity;
a first transmitter module coupled to opposite sides of the first transmitter surface gap to induce an electric current around the first transmitter annular cavity; and
a first receiver module coupled to opposite sides of the first receiver surface gap to detect currents induced around the first receiver annular cavity.
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Abstract
A first magnetic cavity transmitter is in the conductive tool body. A first magnetic cavity receiver is in the conductive tool body. A first transmit module is coupled to the first magnetic cavity transmitter. A first receiver module is coupled to the first magnetic cavity receiver.
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Citations
17 Claims
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1. An apparatus comprising:
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a conductive tool body comprising; a first transmitter comprising; a first transmitter annular cavity that encircles the conductive tool body, a first transmitter surface gap that encircles the conductive tool body and electromagnetically couples the first transmitter annular cavity to an external surface of the conductive tool body, and a first transmitter ring of high magnetic permeability material in the first transmitter annular cavity; a first receiver comprising; a first receiver annular cavity, a first receiver surface gap that electromagnetically couples the external surface of the conductive tool body to the first receiver annular cavity, and a first high magnetic permeability material in the first receiver annular cavity; a first transmitter module coupled to opposite sides of the first transmitter surface gap to induce an electric current around the first transmitter annular cavity; and a first receiver module coupled to opposite sides of the first receiver surface gap to detect currents induced around the first receiver annular cavity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An apparatus comprising:
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a conductive tool body; a first magnetic cavity transmitter in the conductive tool body; a first magnetic cavity receiver in a member coupled to the conductive tool body; a first transmit module coupled to the first magnetic cavity transmitter; a first receiver module coupled to the first magnetic cavity receiver; wherein the first magnetic cavity transmitter includes; a first transmitter annular cavity that encircles the conductive tool body; a first transmitter surface gap that encircles the conductive tool body and electromagnetically couples the first transmitter annular cavity to an external surface of the conductive tool body; wherein the first magnetic cavity receiver includes; a first receiver annular cavity; a first receiver surface gap that electromagnetically couples the external surface of the member to the first receiver annular cavity; and a first high magnetic permeability material in the first receiver annular cavity; wherein the first transmitter module is coupled to opposite sides of the first transmitter surface gap to induce an electric current around the first transmitter annular cavity; and wherein the first receiver module coupled to opposite sides of the first receiver surface gap to detect currents induced around the first receiver annular cavity. - View Dependent Claims (17)
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Specification