Multi-function natural gamma ray logging system
US4585939A · kind A · utility
31Cited by
3References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 5, 1983 |
| Grant date | Apr 29, 1986 |
| Priority date | — |
| Expiry date | Oct 5, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V5/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A multi-function compensated spectral natural gamma ray logging method provides for determining formation and borehole characteristics directly from naturally occurring formation radiation. The method, which measures formation lithology in open holes and mean casing thickness in cased wells, incorporates active compensation for differences in borehole conditions when calculating relative elemental formation abundancies or concentrations of potassium (K), uranium (U) and thorium (T).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.