Method and apparatus for differentiating oil based mud filtrate from connate oil
US6107796A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 17, 1998 |
| Grant date | Aug 22, 2000 |
| Priority date | — |
| Expiry date | Aug 17, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/4625
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for processing nuclear magnetic resonance (NMR) information to differentiate between oil based mud filtrate (OBM), and connate oils, during subsurface exploration. An NMR experiment is performed on a sample of formation fluid, and the resulting data is then processed to differentiate between the relaxation time parameters characteristic of OBMs and those characteristic of connate oils. A simple arithmetic difference between relaxation times calculated for successive samples may be followed by a distributional analysis performed in either the time domain or relaxation spectrum domain. The process is repeated for other fluid samples and the data for successive fluid samples is compared so that the user may determine when the formation fluid consists almost entirely of connate oil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.