TILTED ANTENNA BOBBINS AND METHODS OF MANUFACTURE
First Claim
Patent Images
1. 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 by the outer radial surface, each channel including a first sidewall, a second sidewall opposite the first sidewall, a floor, and an annular pocket jointly defined by the first sidewall and the floor, the first sidewall extending from the outer radial surface to an intermediate location in the cylindrical body at a first angle and extending from the intermediate location to the floor at a second angle, the first angle being non-orthogonal to the outer radial surface and the second angle being orthogonal to the outer radial surface, wherein the annular pocket includes an angled leg that represents a portion of the first sidewall from the intermediate location in the cylindrical body to the floor, wherein each channel further provides a first transition surface between the angled leg and the floor and a second transition surface between the second sidewall and the floor, wherein at least one of the first and second transition surfaces is curved; and
a coil including one or more wires wrapped about the bobbin and received within the one or more channels; and
obtaining measurements of a surrounding subterranean formation with the wellbore logging tool.
1 Assignment
0 Petitions
Accused Products
Abstract
An antenna assembly includes a bobbin that provides a cylindrical body that defines an outer radial surface, an inner radial surface, and a central axis. One or more channels are defined on the outer radial surface, and each channel provides a first sidewall, a second sidewall opposite the first sidewall, a floor, and a pocket jointly defined by the first sidewall and the floor. A coil including one or more wires is wrapped about the bobbin and received within the one or more channels.
2 Citations
20 Claims
-
1. 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 by the outer radial surface, each channel including a first sidewall, a second sidewall opposite the first sidewall, a floor, and an annular pocket jointly defined by the first sidewall and the floor, the first sidewall extending from the outer radial surface to an intermediate location in the cylindrical body at a first angle and extending from the intermediate location to the floor at a second angle, the first angle being non-orthogonal to the outer radial surface and the second angle being orthogonal to the outer radial surface, wherein the annular pocket includes an angled leg that represents a portion of the first sidewall from the intermediate location in the cylindrical body to the floor, wherein each channel further provides a first transition surface between the angled leg and the floor and a second transition surface between the second sidewall and the floor, wherein at least one of the first and second transition surfaces is curved; and a coil including one or more wires wrapped about the bobbin and received within the one or more channels; and obtaining measurements of a surrounding subterranean formation with the wellbore logging tool. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method, comprising:
obtaining azimuthally-sensitive resistivity measurements relating to a subterranean formation using a wellbore logging tool, the wellbore logging tool including a bobbin secured to a tool mandrel, wherein the bobbin includes; a cylindrical body defining an outer radial surface, an inner radial surface, and a central axis; a channel defined by the outer radial surface, the channel including a first sidewall, a second sidewall opposite the first sidewall, a floor, and an annular pocket jointly defined by the first sidewall and the floor, the first sidewall extending from the outer radial surface to an intermediate location in the cylindrical body at a first angle and extending from the intermediate location to the floor at a second angle, the first angle being non-orthogonal to the outer radial surface and the second angle being orthogonal to the outer radial surface, wherein the annular pocket includes an angled leg that represents a portion of the first sidewall from the intermediate location in the cylindrical body to the floor, wherein each channel further provides a first transition surface between the angled leg and the floor and a second transition surface between the second sidewall and the floor, wherein at least one of the first and second transition surfaces is curved; and a wire extending about the bobbin within the channel. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
Specification