Apparatus and method for computing a distribution of spin-spin relaxation times
US6184681A · kind A · utility
14Cited by
15References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 5, 1998 |
| Grant date | Feb 6, 2001 |
| Priority date | — |
| Expiry date | Nov 5, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N24/081
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention is directed to a method for computing a distribution of spin--spin relaxation times. The spin-echo amplitudes are obtained by hardware integration of the receiver voltages over a time window. A linear operator is utilized to map a relaxation-time distribution to spin-echoes, produce a singular value decomposition (SVD) of the linear operator, determine vectors of the SVD, and compress the spin-echo data using the vectors. To eliminate a telemetry bottleneck, the T.sub.2 spectrum is computed downhole and transmitted to the surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.