System and method for emulating nuclear magnetic resonance well logging tool diffusion editing measurements on a bench-top nuclear magnetic resonance spectrometer for laboratory-scale rock core analysis
US8427145B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 2010 |
| Grant date | Apr 23, 2013 |
| Priority date | — |
| Expiry date | Jul 25, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/448
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A laboratory NMR methodology (and corresponding laboratory apparatus) defines a sample volume. The method stores downhole tool data corresponding to a hydrocarbon-bearing sample collected from a given subsurface formation. The downhole tool data includes parameters pertaining to magnetic fields used by a downhole tool during a suite of NMR measurements of the given subsurface formation. The sample is positioned in the sample volume of the laboratory apparatus, which applies a static magnetic field in the sample volume. Furthermore, the laboratory apparatus applies a suite of NMR measurements to the sample volume to thereby determine a property of the sample. The NMR measurements of the suite each include a pulse sequence of oscillating magnetic field in conjunction with a pulsed-mode gradient field. The pulsed-mode gradient field is based on the stored downhole tool data corresponding to the sample. A laboratory NMR methodology for optimizing downhole NMR measurements is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.