Computer-controlled, portable pulsed NMR instrument and method of use wherein depolarization is ultrashortened using pseudo randomly spaced and oriented RF depolarization pulses
US4542343A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 17, 1983 |
| Grant date | Sep 17, 1985 |
| Priority date | — |
| Expiry date | Jun 17, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/46
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In accordance with the present invention, fluid-flow properties of a rock sample based on NMR response of the hydrogen nuclei of interstitial fluids within the pore space of such sample, can be swiftly and accurately achieved using a computer-controlled, portable NMR instrument. Inherent instrument inadequacy of a DC field inhomogeneity is controllably augmented by a depolarizing code (provided via a computer-controller controlling a transmitter-pulser) to ensure complete magnetic memory erasing prior to a new measuring cycle. Result: Even though the instrument is placed at field sites away from the usual processing center, quick analysis of rock samples as during the drilling of a well, results.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.