Induced gamma ray spectorscopy well logging system
US5406078A · kind A · utility
36Cited by
14References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 28, 1994 |
| Grant date | Apr 11, 1995 |
| Priority date | — |
| Expiry date | Mar 28, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V5/101
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for measuring fast neutron induced gamma ray energy spectra in cased wellbores. The system includes an electronic source of monoenergetic 14 MeV fast neutrons, a high density bismuth germanate scintillation detector, a downhole pulse height analyzer and a highly accurate gain stabilizer circuit. The gain stabilization utilizes the iron (Fe) edge in the catpure gamma ray spectrum to establish system gain since iron is always present in the tool case and the wellbore casing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.