Natural gamma ray logging sub
US5285065A · kind A · utility
9Cited by
5References
9Claims
0Family size
Inventors
Key dates
| Filing date | Aug 17, 1992 |
| Grant date | Feb 8, 1994 |
| Priority date | — |
| Expiry date | Aug 17, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/01
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A natural gamma tag marking materials for sub or permanent markers used in gamma logging operations, such natural gamma materials having a gamma count of between 200 and 1000 counts per second. The instant invention further discloses a typical Sub, for insertion in a drilling operation, utilizing natural gamma element compounds which are considered to be non-hazardous and effective as tag markers when used in wireline logging operations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.