Downhole detection
First Claim
1. A system for use in downhole detection comprising:
- a downhole arrangement defining a throughbore;
a tool deployable through the throughbore of the downhole arrangement;
a primary electromagnetic element provided on the deployable tool; and
a secondary electromagnetic element provided on the downhole arrangement,wherein the primary and secondary electromagnetic elements are configurable for electromagnetic coupling therebetween,wherein the downhole arrangement is configurable between a first configuration in which the secondary electromagnetic element is covered so as to prevent electromagnetic coupling between the primary and secondary electromagnetic elements and a second configuration in which the secondary electromagnetic element is accessible for electromagnetic coupling with the primary electromagnetic element.
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Accused Products
Abstract
A system for use in downhole detection comprises a downhole arrangement defining a throughbore and a tool deployable through the throughbore of the downhole arrangement. The system further comprises a primary electromagnetic element provided on one of the downhole arrangement and the deployable tool and a secondary electromagnetic element provided on the other of the downhole arrangement and the deployable tool, wherein the primary and secondary electromagnetic elements are configurable for electromagnetic coupling therebetween. Such a system may be used for determining a status and/or an identity of a downhole tool in an oil or gas well from a determined degree of electromagnetic coupling between the primary and secondary electromagnetic elements.
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Citations
72 Claims
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1. A system for use in downhole detection comprising:
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a downhole arrangement defining a throughbore; a tool deployable through the throughbore of the downhole arrangement; a primary electromagnetic element provided on the deployable tool; and a secondary electromagnetic element provided on the downhole arrangement, wherein the primary and secondary electromagnetic elements are configurable for electromagnetic coupling therebetween, wherein the downhole arrangement is configurable between a first configuration in which the secondary electromagnetic element is covered so as to prevent electromagnetic coupling between the primary and secondary electromagnetic elements and a second configuration in which the secondary electromagnetic element is accessible for electromagnetic coupling with the primary electromagnetic element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59)
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60. A downhole arrangement for use in downhole detection, the downhole arrangement defining a throughbore for deployment of a deployable tool therethrough and the downhole arrangement comprising secondary electromagnetic element configurable for electromagnetic coupling with a primary electromagnetic element provided on the deployable tool, wherein the downhole arrangement is configurable between a first configuration in which the secondary electromagnetic element is covered so as to prevent electromagnetic coupling between the primary and secondary electromagnetic elements and a second configuration in which the secondary electromagnetic element is accessible for electromagnetic coupling with the primary electromagnetic element.
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61. A system for use in downhole detection comprising:
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a downhole arrangement defining a throughbore; a tool deployable through the throughbore of the downhole arrangement; a primary electromagnetic element provided on the deployable tool; and a secondary electromagnetic element provided on the downhole arrangement, wherein the primary and secondary electromagnetic elements are configurable for electromagnetic coupling therebetween, wherein the secondary electromagnetic element comprises a plurality of electrically conductive rings distributed axially along a longitudinal axis of the downhole arrangement, each ring extending around the throughbore of the downhole arrangement, and wherein each ring is configured such that electromagnetic coupling of each ring with the primary electromagnetic element provides a corresponding measured electrical signal having a characteristic frequency spectrum.
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62. A system for use in downhole detection comprising:
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a downhole arrangement defining a throughbore; a tool deployable through the throughbore of the downhole arrangement; a primary electromagnetic element provided on one of the downhole arrangement and the deployable tool; and a secondary electromagnetic element provided on the other of the downhole arrangement and the deployable tool; and a controller, wherein the primary and secondary electromagnetic elements are configurable for electromagnetic coupling therebetween, and wherein the controller is configured to measure an electrical signal which varies with a degree of electromagnetic coupling between the primary and secondary electromagnetic elements and to determine the degree of electromagnetic coupling between the primary and secondary electromagnetic elements from measurements of the electrical signal across a range of frequencies. - View Dependent Claims (63, 64, 65, 66, 67, 68, 69, 70, 71, 72)
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Specification