Modified triaxial antenna array
AssigneeSchlumberger Technology Corporation
InventorsScott Dyas, Dean M. Homan, Sergiy Kryukov, Reza Taherian, Daniel Codazzi
Life of this patent
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Abstract
Various triaxial antenna designs having are provided. Some embodiments include a split-z coil that can include two axial coils with saddle coils in the x- and y-directions located therebetween. The split z-coils can function by having a combined magnetic moment similar to that of a single axial coil located between the two parts of the split z-coil. In some examples, the antenna assemblies can include a protrusion or other non-planar structure.
Claims9
1-25. (canceled)
An antenna assembly for an electromagnetic logging tool comprising a first antenna, the first antenna comprising:
- a first leg extending substantially radially over a first portion of a circumference of the logging tool;
- a second leg connected to the first leg, the second leg extending substantially axially over a length of the tool;
- a third leg connected to the second leg, the third leg extending substantially radially over a second portion of the circumference of the logging tool;
- and
- a fourth leg connected to the third leg and the first leg, the fourth leg extending substantially axially over the length of the tool.
An electromagnetic logging tool comprising:
- an antenna comprising a primary section and a first protrusion section;
- wherein the primary section is disposed within a plane,
- wherein the primary section comprises a majority of the antenna, and
- wherein the first protrusion section is disposed outside of the plane.
The triaxial antenna assembly of claim 6, wherein the four saddle coils comprise a first pair of coils in an x-direction and a second pair of coils in one of a y-direction and a z-direction, and
- wherein the shield is configured to force fields in a first direction generated by the first pair of coils and a second direction generated by the second pair of coils to be equal by varying a length of the slots.
Dependencies are inferred from the claim text.