Replaceable antennas for wellbore apparatus
First Claim
1. An antenna for use in a downhole tool, comprising:
- a first partial ring section disposed within a portion of a recess in and extending circumferentially around a tubular, the first partial ring section having two ends;
a first coil disposed on or in the first partial ring section, the first coil providing a current path that extends less than about 180 degrees about the tubular;
a second partial ring section disposed within a different portion of the recess and having two ends; and
a second coil disposed on or in the second partial ring section, the second coil providing a current path that extends less than about 180 degrees about the tubular;
wherein the ring sections are removeably secured to the tubular.
1 Assignment
0 Petitions
Accused Products
Abstract
An antenna structure is separately and independently formed with respect to a downhole tool. The antenna is adapted for easy and rapid deployment on the tool. An independently formed ‘partial ring section’ (or arcuate shaped member) contains an antenna coil. In one embodiment, two or more of the independently formed partial ring sections are placed in a recess on the tubular forming the downhole tool. In another embodiment, the partial ring sections can also be placed in one or more longitudinally distributed sections about the tool. Another embodiment includes partial ring sections forming an antenna with multiple coils of differing orientation to provide directional sensitivity.
55 Citations
21 Claims
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1. An antenna for use in a downhole tool, comprising:
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a first partial ring section disposed within a portion of a recess in and extending circumferentially around a tubular, the first partial ring section having two ends; a first coil disposed on or in the first partial ring section, the first coil providing a current path that extends less than about 180 degrees about the tubular; a second partial ring section disposed within a different portion of the recess and having two ends; and a second coil disposed on or in the second partial ring section, the second coil providing a current path that extends less than about 180 degrees about the tubular; wherein the ring sections are removeably secured to the tubular. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method to repair or reconfigure an antenna disposed on a wellbore tool, comprising:
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removing one or more partial ring sections disposed within a recess in and extending circumferentially around a tubular, each of the one or more partial ring sections having two ends and one or more coils disposed on or in the partial ring section, each of the one or more coils providing a current path that extends less than about 180 degrees about the tubular; removeably securing one or more replacement partial ring sections within the recess, each of the one or more replacement partial ring sections having two ends and one or more coils disposed on or in the replacement partial ring section, each of the one or more coils providing a current path that extends less than about 180 degrees about the tubular; and coupling an electrical source to one or more of the one or more coils disposed on or in the one or more replacement partial ring sections. - View Dependent Claims (19, 20, 21)
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Specification