Downhole sensor tool for nuclear measurements
US8993957B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 2010 |
| Grant date | Mar 31, 2015 |
| Priority date | — |
| Expiry date | Jun 6, 2030 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A downhole measurement apparatus includes a tool body supporting a logging tool. The logging tool includes a detector outsert coupled into and exposed through an exterior pocket of the tool body to position the outer surface of the outsert adjacent or in close proximity to the outer diameter of the tool body. A stabilizer or off-center stabilizer may be provided to further deflect the outsert portion of the logging tool toward an earth formation to increase detector proximity to the formation. The axial distance between the detector and a nuclear source can be calibrated using configurations of the nuclear source holder and the outsert. Retention mechanisms for the source holder and the outsert further enhance proximity and calibration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.