Single layer antenna path profile

Patent metadata

Field	Value
Publication number	US-11053793-B2
Application number	US-201716346065-A
Country	US
Kind code	B2
Filing date	Nov 7, 2017
Priority date	Dec 22, 2016
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

A single layer antenna path profile is provided. An antenna assembly for the single layer antenna profile includes a bobbin having a cylindrical body defining an outer radial surface, an inner radial surface, and a central axis. The antenna assembly also includes one or more channels defined in the outer radial surface. In some aspects, each channel is defined by a continuously curved inner surface having a constant radius. In some aspects, the inner surface extends more than 180 but less than 360 and thereby defines an opening in the body. The antenna assembly also includes a coil including a wire wrapped about the bobbin and received within the one or more channels. In some aspects, an arcuate portion of the wire extends through the opening such that a portion of the wire protrudes out of the channel.

First claim

What is claimed is:

1. An antenna assembly, comprising:
a bobbin secured to an outer surface of a tool mandrel, the bobbin having a cylindrical body defining an outer radial surface, an inner radial surface, and a central axis;
one or more channels defined in the outer radial surface, wherein each channel is defined by a continuously curved inner surface having a constant radius, and wherein the continuously curved inner surface extends more than 180° but less than 360° and thereby defines an opening in the cylindrical body; and
a coil including a wire wrapped about the bobbin and received within the one or more channels, wherein an arcuate portion of the wire extends through the opening such that a portion of the wire protrudes out of the channel.

2. The antenna assembly of claim 1 , wherein the opening exhibits a width that is greater than or equal to a diameter of the wire.

3. The antenna assembly of claim 1 , wherein the continuously curved inner surface encircles more than 180° but less than 360° of a circumference of the wire.

4. The antenna assembly of claim 1 , wherein the one or more channels comprise a plurality of independent annular grooves defined in the outer radial surface and axially offset from each other.

5. The antenna assembly of claim 1 , wherein the one or more channels comprise a single helical annular groove that continuously winds about a circumference of the bobbin.

6. The antenna assembly of claim 1 , wherein the one or more channels extend about a circumference of the bobbin at a winding angle with respect to the central axis, and wherein the winding angle ranges between perpendicular and parallel to the central axis.

7. The antenna assembly of claim 6 , wherein the winding angle is 45° offset from the central axis.

8. A method, comprising:
introducing a wellbore logging tool into a wellbore, the wellbore logging tool including a tool mandrel and a bobbin secured to an outer surface of the tool mandrel, wherein the bobbin includes:
a cylindrical body defining an outer radial surface, an inner radial surface, and a central axis;
one or more channels defined in the outer radial surface, wherein each channel is defined by a continuously curved inner surface having a constant radius, and wherein the continuously curved inner surface extends more than 180° but less than 360° and thereby defines an opening in the cylindrical body; and
a coil including a wire wrapped about the bobbin and received within the one or more channels, wherein an arcuate portion of the wire extends through the opening such that a portion of the wire protrudes out of the channel; and

obtaining measurements of a surrounding subterranean formation with the wellbore logging tool.

9. The method of claim 8 , wherein the tool mandrel is operatively coupled to a drill string and introducing the wellbore logging tool into the wellbore further comprises:
extending the wellbore logging tool into the wellbore on the drill string; and
drilling a portion of the wellbore with a drill bit secured to a distal end of the drill string.

10. The method of claim 8 , wherein introducing the wellbore logging tool into the wellbore further comprises extending the wellbore logging tool into the wellbore on wireline as part of a wireline instrument sonde.

11. The method of claim 8 , wherein the opening exhibits a width that is greater than or equal to a diameter of the wire.

12. The method of claim 8 , wherein the one or more channels comprise a plurality of independent annular grooves defined in the outer radial surface and axially offset from each other.

13. The method of claim 8 , wherein the one or more channels comprise a single helical annular groove that continuously winds about a circumference of the bobbin.

14. The method of claim 8 , wherein the one or more channels extend about a circumference of the bobbin at a winding angle with respect to the central axis, and wherein the winding angle ranges between perpendicular and parallel to the central axis.

15. The method of claim 14 , wherein the winding angle is 45° offset from the central axis.

16. A system comprising:
a logging tool comprising a tool mandrel and an antenna assembly, the antenna assembly comprising,
a bobbin secured to an outer surface of the tool mandrel, the bobbin having a cylindrical body defining an outer radial surface, an inner radial surface, and a central axis;
one or more channels defined in the outer radial surface, wherein each channel is defined by a continuously curved inner surface having a constant radius, and wherein the continuously curved inner surface extends more than 180° but less than 360° and thereby defines an opening in the cylindrical body; and
a coil including a wire wrapped about the bobbin and received within the one or more channels, wherein an arcuate portion of the wire extends through the opening such that a portion of the wire protrudes out of the channel.

17. The system of claim 16 , wherein the logging tool is part of a bottom hole assembly, the system comprising a drill string coupled to the bottom hole assembly, wherein the drill string comprises a drill bit.

18. The system of claim 16 , wherein the opening exhibits a width that is greater than or equal to a diameter of the wire.

19. The system of claim 16 , wherein the one or more channels comprise a plurality of independent annular grooves defined in the outer radial surface and axially offset from each other.

20. The system of claim 16 , wherein the one or more channels comprise a single helical annular groove that continuously winds about a circumference of the bobbin, wherein the one or more channels extend about a circumference of the bobbin at a winding angle with respect to the central axis, and wherein the winding angle ranges between perpendicular and parallel to the central axis.

Assignees

• Halliburton Energy Services Inc

Inventors

• Hensarling Jesse K
• Mohon Brian
• Korovin Alexei
• Vehra Imran Sharif

Classifications

• E21B47/12

  Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling · CPC title

• E21B47/13

  by electromagnetic energy, e.g. radio frequency · CPC title

• G01V3/28 Primary

  using induction coils · CPC title

• H01Q1/04

  Adaptation for subterranean or subaqueous use · CPC title

• E21B49/00 Primary

  Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells · CPC title