E21B 47/111
Using radioactivity
Official title: {using radioactivity}
E21B47/111 (Using radioactivity) appears on 127 US grants and 61 published applications in this corpus.
Search patents in E21B- Granted patents
- 127
- Published applications
- 61
- Assignees
- 68
- Inventors
- 239
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 7 | 0 |
| 1978 | 4 | 0 |
| 1979 | 5 | 0 |
| 1980 | 6 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 3 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 4 | 0 |
| 1987 | 3 | 0 |
| 1988 | 6 | 0 |
| 1989 | 5 | 0 |
| 1990 | 3 | 0 |
| 1991 | 5 | 0 |
| 1992 | 5 | 0 |
| 1993 | 6 | 0 |
| 1994 | 4 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 0 |
| 2004 | 1 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 2 |
| 2008 | 0 | 1 |
| 2009 | 0 | 1 |
| 2010 | 3 | 1 |
| 2011 | 0 | 4 |
| 2012 | 1 | 2 |
| 2013 | 1 | 0 |
| 2014 | 1 | 1 |
| 2015 | 1 | 1 |
| 2016 | 2 | 2 |
| 2017 | 2 | 5 |
| 2018 | 2 | 4 |
| 2019 | 7 | 10 |
| 2020 | 3 | 1 |
| 2021 | 5 | 5 |
| 2022 | 3 | 4 |
| 2023 | 7 | 5 |
| 2024 | 2 | 4 |
| 2025 | 5 | 3 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Monitoring a hazardous waste repository11 Aug 2026US 12,703,017 B2Deep Isolation, Inc.
- Method and apparatus for evaluating the expansion of shape memory polymer in well completions2 Dec 2025US 12,486,760 B2Baker Hughes Oilfield Operations LLC
- Shaped charge liners with integrated tracers4 Nov 2025US 12,460,906 B2Damorphe
- System and method for data handling in downhole operations16 Sep 2025US 12,416,231 B2Baker Hughes Oilfield Operations LLC
- Plug, system and method for testing the integrity of a well barrier8 Jul 2025US 12,352,156 B2Exedra AS
- Flow rate measurement tool based on fluid transit in wells with polymer injection, sealing and recharging system of said tool, flow rate measurement method using said tool and signal processing method5 Feb 2026US 2026/0036043 A1Consejo Nacional De Investigaciones Cientificas Y Tecnicas (Conicet)
- Enhanced geothermal systems and methods8 Jan 2026US 2026/0009324 A1Resman AS
- Analysis of drilling cuttings1 Jan 2026US 2026/0002440 A1ConocoPhillips Company
- Tracer particles and related methods23 Oct 2025US 2025/0327398 A1Saudi Arabian Oil Company
- Method for deep well testing and permeability determination in different directions17 Apr 2025US 2025/0122796 A1Saudi Arabian Oil Company
Most cited
By later US patents
- Method utilizing spot tracer injection and production induced transport for measurement of residual oil saturation329US 5,168,927 AShell Oil Company · 1992
- Encapsulated radioactive tracer97US 5,929,437 AProtechnics International, Inc. · 1999
- Systems of injecting phenolic resin activator during subsurface fracture stimulation for enhanced oil recovery90US 5,595,245 A1997
- Raioactive tracing with particles79US 5,182,051 AProtechnics International, Inc. · 1993
- Use of tracers to monitor in situ miscibility of solvent in oil reservoirs during EOR55US 5,111,882 AExxon Production Research Company · 1992