Front tangential antenna for nuclear magnetic resonance (NMR) well logging

摘要

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.

主权项

1. 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.