Evaluation of liquid-containing samples using nuclear magnetic resonance
US5200699A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 1991 |
| Grant date | Apr 6, 1993 |
| Priority date | — |
| Expiry date | Sep 25, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/32
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method is provided for evaluating the potential productivity of a zone of a formation in regard to hydrocarbons substantially free of water, and according to another aspect the method can determine the residual saturation of any porous media with respect to any particular saturating liquid. At least one sample from a zone is saturated with a saturating liquid, such as a saturating liquid comprising water, and the nuclear magnetization of the liquid is substantially inverted by means of at least one NMR radio frequency pulse. A component of the nuclear magnetization is detected at different delay times following application of such a pulse, from which the delay time (NMR zero time) is determined at which the magnetization component is zero. Potential productivity of dry hydrocarbons from the zone and/or residual saturation of the core sample is determined based on the NMR zero time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.