Nuclear magnetic resonance logging based on steady-state free precession
US6580272B2 · kind B2 · utility
9Cited by
6References
37Claims
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Key dates
| Filing date | Nov 6, 2001 |
| Grant date | Jun 17, 2003 |
| Priority date | — |
| Expiry date | Nov 6, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/5613
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Nuclear magnetic resonance logging methods that detect and analyze a steady state free precession (SSFP) signal are described. In some embodiments, Carr-Purcell-Meiboom-Gill (CPMG) spin echoes are detected along with the SSFP signals. From the SSFP signal, either alone or in combination with CPMG signals, information about a region of an earth formation, such as porosity, bound fluid volume and diffusion, may be extracted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.