Polished downhole transducer having improved signal coupling
First Claim
1. A transmission element for transmitting information between downhole tools located on a drill string, the transmission element comprising:
- an annular core constructed of a magnetically-conductive material, the annular core forming an open channel around the circumference thereof, the annular core further configured to mate with a corresponding annular core along an annular mating surface, thereby forming a closed channel;
an annular conductor disposed within the open channel; and
the mating surface being further polished to provide improved magnetic coupling with the corresponding annular core.
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Accused Products
Abstract
Apparatus and methods to improve signal coupling in downhole inductive transmission elements to reduce the dispersion of magnetic energy at the tool joints and to provide consistent impedance and contact between transmission elements located along the drill string. A transmission element for transmitting information between downhole tools is disclosed in one embodiment of the invention as including an annular core constructed of a magnetically conductive material. The annular core forms an open channel around its circumference and is configured to form a closed channel by mating with a corresponding annular core along an annular mating surface. The mating surface is polished to provide improved magnetic coupling with the corresponding annular core. An annular conductor is disposed within the open channel.
28 Citations
20 Claims
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1. A transmission element for transmitting information between downhole tools located on a drill string, the transmission element comprising:
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an annular core constructed of a magnetically-conductive material, the annular core forming an open channel around the circumference thereof, the annular core further configured to mate with a corresponding annular core along an annular mating surface, thereby forming a closed channel; an annular conductor disposed within the open channel; and the mating surface being further polished to provide improved magnetic coupling with the corresponding annular core. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for improving signal transmission between transmission elements transmitting information between downhole tools, the method comprising:
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providing an annular core constructed of a magnetically conductive material, the annular core forming an open channel around the circumference thereof, the annular core further configured to mate with a corresponding annular core along an annular mating surface, in order to form a closed channel; providing an annular conductor in the open channel; and polishing the mating surface to improve magnetic coupling with the corresponding annular core. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification