Antenna cutout in a downhole tubular
First Claim
Patent Images
1. An apparatus comprising:
- a tubular to operate downhole, the tubular having a longitudinal axis and a circumferential cutout extending around a cutout axis that lies at an angle to the longitudinal axis of the tubular that is other than 90 degrees, the cutout thus extending at a diagonal relative to the longitudinal axis, wherein a width of the cutout is in a range of approximately one to four inches;
an antenna positioned in the diagonally extending cutout, the antenna to perform at least one of a transmission or reception of an electromagnetic signal that has a path that is to traverse a subsurface formation; and
a diagonally extending non-magnetic sleeve positioned within the diagonally extending cutout to cover the antenna therein, the sleeve having a plurality of openings, and further having outer sides conforming to wall surfaces of the cutout.
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Abstract
In some embodiments, an apparatus (200) includes a tubular to operate downhole. The tubular has a longitudinal axis and has a cutout (210N) that has a direction that is other than 90 degrees to the longitudinal axis of the tubular. The apparatus also includes an antenna (202A) positioned in the cutout of the tubular. The antenna is to perform at least one of a transmission or reception of an electromagnetic signal that has a path that is to traverse a subsurface formation.
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Citations
22 Claims
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1. An apparatus comprising:
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a tubular to operate downhole, the tubular having a longitudinal axis and a circumferential cutout extending around a cutout axis that lies at an angle to the longitudinal axis of the tubular that is other than 90 degrees, the cutout thus extending at a diagonal relative to the longitudinal axis, wherein a width of the cutout is in a range of approximately one to four inches; an antenna positioned in the diagonally extending cutout, the antenna to perform at least one of a transmission or reception of an electromagnetic signal that has a path that is to traverse a subsurface formation; and a diagonally extending non-magnetic sleeve positioned within the diagonally extending cutout to cover the antenna therein, the sleeve having a plurality of openings, and further having outer sides conforming to wall surfaces of the cutout. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus comprising:
a tubular for downhole operations, the tubular having a longitudinal axis and comprising; a transmitter antenna to emit an electromagnetic wave into a subsurface formation; a first receiver antenna positioned in a first circumferential cutout in the tubular extending around a first cutout axis that lies at an angle to the longitudinal axis of the tubular that is other than 90 degrees, the first circumferential cutout thus extending at a diagonal relative to the longitudinal axis of the tubular, wherein a width of the first circumferential cutout is in a range of approximately one to six inches, wherein a diagonally extending non-magnetic first sleeve is positioned within the first circumferential cutout to cover the first receiver antenna, the first sleeve having a plurality of first openings and first outer sides conforming to first wall surfaces of the first circumferential cutout, the first receiver antenna to receive an induced electromagnetic wave produced from the electromagnetic wave that is emitted into the subsurface formation; and a second receiver antenna positioned in a second circumferential cutout in the tubular extending around a second cutout axis that lies at an angle to the longitudinal axis of the tubular that is other than 90 degrees, the second circumferential cutout thus extending at a diagonal relative to the longitudinal axis of the tubular, wherein a width of the second circumferential cutout is in a range of approximately one to four inches, and wherein a diagonally extending non-magnetic second sleeve is positioned within the second circumferential cutout to cover the second receiver antenna, the second sleeve having a plurality of second openings and second outer sides conforming to second wall surfaces of the second circumferential cutout, the second receiver antenna to receive an induced electromagnetic wave produced from the electromagnetic wave that is emitted into the subsurface formation. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method comprising:
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transmitting a transmit electromagnetic wave into a subsurface formation using a transmitter antenna disposed circumferentially around a tool for downhole operations; and receiving a first induced electromagnetic wave, which is a result of the transmitted electromagnetic wave, with a first receiver antenna disposed circumferentially around the tool in a first circumferential cutout in the tool, wherein an axis of the first receiver antenna and a cutout axis of the first circumferential cutout are at an angle other than 90 degrees relative to a longitudinal axis of the tool, wherein the first circumferential cutout extends at a diagonal relative to the longitudinal axis and a width of the first circumferential cutout is in a range of approximately one to four inches, and wherein the tool includes a diagonally extending non-magnetic sleeve disposed within the first circumferential cutout to cover the first receiver antenna, the metallic sleeve having one or more openings and outer sides conforming to wall surfaces of the first circumferential cutout. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification