Pulsed nuclear magnetism tool for formation evaluation while drilling
US5923167A · kind A · utility
33Cited by
43References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1997 |
| Grant date | Jul 13, 1999 |
| Priority date | — |
| Expiry date | Mar 17, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/32
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A logging-while-drilling tool contains a pulsed nuclear magnetic resonance (NMR) device for evaluating earth formations. An antenna of the pulsed NMR device is electromagnetically coupled with a drill collar of the tool for evaluating earth formations. In this way, the antenna generates a magnetic dipole parallel to a surface of the drill collar and the drill collar enhances the electromagnetic field generated by the antenna.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.