Well logging method and apparatus for determining gas and diffusion coefficient using NMR
US6023163A · kind A · utility
30Cited by
8References
16Claims
0Family size
Assignee
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Key dates
| Filing date | Jun 12, 1997 |
| Grant date | Feb 8, 2000 |
| Priority date | — |
| Expiry date | Jun 12, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/32
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a method for determining the presence of gas in a region of investigation of earth formations surrounding a borehole. A movable logging device is used to generate two sequences of magnetic field pulses having different pulse spacing times. Each of the pulse sequences elicits a corresponding sequence of nuclear magnetic resonance spin echoes. The presence of gas in the formation, is determined from ratios of signals derived from the two spin echoes sequences.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.