Front tangential antenna for nuclear magnetic resonance (NMR) well logging
AssigneeHalliburton Energy Services, Inc.
InventorsRebecca Jachmann, George David Goodman
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Abstract
The magnet and antenna assemblies of a logging tool can be arranged according to geometries optimal for concentric or eccentric well logging operations. In an example configuration, a logging tool can include a magnet, a magnetic core made of a magnetically permeable material, and an antenna. The outward path of the antenna can be positioned along a surface of the magnetically permeable magnetic core that faces away from the magnet, and the return path of the antenna can also be positioned along a surface that faces away from the magnet.
Claims36
A nuclear magnetic resonance system for well logging using an axially-extending tool, the system comprising:
- a magnet;
- a core having a first surface facing the magnet and one or more other surfaces facing away from the magnet;
- and
- an antenna positioned along at least one of the one or more other surfaces, the antenna comprising a first loop of electrically conductive material and a second loop of electrically conductive material, the first and second loops comprising a common segment extending along an axis of the axially-extending tool.
A method comprising:
- obtaining an axially extending magnetic resonance well logging tool comprising:
- a magnet;
- and
- a core having a first surface facing the magnet and one or more other surfaces facing away from the magnet;
- positioning an antenna along at least one of the one or more other surfaces, wherein the antenna comprises a first loop of electrically conductive material and a second loop of electrically conductive material, and the first and second loops comprise a common segment extending along an axis of the axially-extending tool.
Dependencies are inferred from the claim text.