E21B 47/053
Using radioactive markers
Official title: using radioactive markers
E21B47/053 (Using radioactive markers) appears on 52 US grants and 37 published applications in this corpus.
Search patents in E21B- Granted patents
- 52
- Published applications
- 37
- Assignees
- 25
- Inventors
- 102
- Latest grant
- 26 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 2 |
| 2003 | 0 | 1 |
| 2004 | 1 | 0 |
| 2005 | 3 | 2 |
| 2006 | 2 | 1 |
| 2007 | 0 | 0 |
| 2008 | 1 | 2 |
| 2009 | 0 | 1 |
| 2010 | 1 | 0 |
| 2011 | 1 | 1 |
| 2012 | 0 | 1 |
| 2013 | 1 | 2 |
| 2014 | 1 | 2 |
| 2015 | 1 | 1 |
| 2016 | 2 | 4 |
| 2017 | 0 | 3 |
| 2018 | 1 | 1 |
| 2019 | 3 | 2 |
| 2020 | 2 | 3 |
| 2021 | 2 | 3 |
| 2022 | 1 | 2 |
| 2023 | 4 | 1 |
| 2024 | 1 | 1 |
| 2025 | 1 | 0 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Systems and methods for differentiating non-radioactive tracers downhole26 May 2026US 12,637,943 B2Carbo Ceramics Inc.
- Position measurement system for correlation array11 Feb 2025US 12,221,877 B2Halliburton Energy Services.Inc.
- Systems and methods for differentiating non-radioactive tracers downhole16 Jul 2024US 12,037,894 B2Carbo Ceramics Inc.
- Methodology for automated verification and qualification of sidewall core recovery depth using borehole image logs26 Sep 2023US 11,767,752 B2Saudi Arabian Oil Company
- Depth positioning using gamma-ray correlation and downhole parameter differential19 Sep 2023US 11,761,327 B2Schlumberger Technology Corporation
- Systems and methods for differentiating non-radioactive tracers downhole24 Sep 2026US 2026/0286839 A1Carbo Ceramics Inc.
- Systems and methods for differentiating non-radioactive tracers downhole17 Oct 2024US 2024/0344450 A1Carbo Ceramics Inc.
- Systems and methods for differentiating non-radioactive tracers downhole10 Aug 2023US 2023/0250719 A1Carbo Ceramics Inc.
- Methodology for automated verification and qualification of sidewall core recovery depth using borehole image logs7 Apr 2022US 2022/0106871 A1Saudi Arabian Oil Company
- System and method for retrieving a source element from a logging tool located in a well10 Mar 2022US 2022/0074300 A1Saudi Arabian Oil Company
Most cited
By later US patents
- Composite coiled tubing apparatus and methods167US 5,828,003 ADowell, a division of Schlumberger Technology Corporation · 1998
- Composite coiled tubing apparatus and methods131US 5,933,945 ADowell Schlumberger Incorporated · 1999
- Reservoir monitoring through modified casing joint117US 6,426,917 B1Schlumberger Technology Corporation · 2002
- Composite coiled tubing apparatus and methods111US 6,065,540 ASchlumberger Technology Corporation · 2000
- Formation pressure measurement with remote sensors in cased boreholes86US 6,070,662 ASchlumberger Technology Corporation · 2000