Systems and methods for deep-looking NMR logging
US7733086B2 · kind B2 · utility
33Cited by
238References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 30, 2008 |
| Grant date | Jun 8, 2010 |
| Priority date | — |
| Expiry date | Dec 6, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N24/081
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An NMR logging tool for conducting NMR measurements in a plurality of sensitive volumes ranging up to a meter from the tool. The tool comprises a magnetic assembly using one or more permanent magnets and at least one pole piece for extending a magnet pole and shaping the magnetic field to simulate a magnetic monopole in a sensitive volume within the formation. Different embodiments of a segmented antenna enable directional NMR logging. The tool embodiments and methods of their use are suitable for wireline or LWD logging, and can be used for directional drilling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.