E21B 47/11
Using tracers
Official title: using tracers; using radioactivity
E21B47/11 (Using tracers) appears on 793 US grants and 757 published applications in this corpus.
Search patents in E21B- Granted patents
- 793
- Published applications
- 757
- Assignees
- 255
- Inventors
- 1,534
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 13 | 0 |
| 1978 | 6 | 0 |
| 1979 | 10 | 0 |
| 1980 | 12 | 0 |
| 1981 | 8 | 0 |
| 1982 | 6 | 0 |
| 1983 | 6 | 0 |
| 1984 | 6 | 0 |
| 1985 | 11 | 0 |
| 1986 | 7 | 0 |
| 1987 | 8 | 0 |
| 1988 | 14 | 0 |
| 1989 | 14 | 0 |
| 1990 | 7 | 0 |
| 1991 | 10 | 0 |
| 1992 | 6 | 0 |
| 1993 | 12 | 0 |
| 1994 | 6 | 0 |
| 1995 | 7 | 0 |
| 1996 | 3 | 0 |
| 1997 | 4 | 0 |
| 1998 | 7 | 0 |
| 1999 | 10 | 0 |
| 2000 | 8 | 0 |
| 2001 | 12 | 4 |
| 2002 | 3 | 9 |
| 2003 | 7 | 9 |
| 2004 | 10 | 16 |
| 2005 | 5 | 5 |
| 2006 | 5 | 10 |
| 2007 | 6 | 9 |
| 2008 | 9 | 7 |
| 2009 | 6 | 16 |
| 2010 | 7 | 18 |
| 2011 | 8 | 26 |
| 2012 | 14 | 25 |
| 2013 | 17 | 22 |
| 2014 | 16 | 32 |
| 2015 | 15 | 39 |
| 2016 | 26 | 44 |
| 2017 | 22 | 43 |
| 2018 | 46 | 44 |
| 2019 | 42 | 53 |
| 2020 | 43 | 39 |
| 2021 | 39 | 45 |
| 2022 | 39 | 46 |
| 2023 | 51 | 58 |
| 2024 | 51 | 56 |
| 2025 | 55 | 53 |
| 2026 | 35 | 29 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method of using tracer compositions having a degradable polymer and a detectable component for tracing gas flow in a hydrocarbon reservoir22 Sep 2026US 12,742,383 B2Saudi Arabian Oil Company
- Fluid diverter8 Sep 2026US 12,729,622 B2Sentinel Subsea Ltd
- Payload deployment tools and methods of using same25 Aug 2026US 12,716,324 B2
- Monitoring a hazardous waste repository11 Aug 2026US 12,703,017 B2Deep Isolation, Inc.
- Deployment and interpretation of tracer technology using downhole equipment11 Aug 2026US 12,704,061 B2Schlumberger Technology Corporation
- Method Of Abating Carbon Dioxide And Hydrogen Sulfide1 Oct 2026US 2026/0295509 A1Barnard College
- Optimizing co2 geosequestration with responsive tracers24 Sep 2026US 2026/0286812 A1Saudi Arabian Oil Company
- System and method of monitoring subterranean reservoirs24 Sep 2026US 2026/0286836 A1Resman AS
- System and method of monitoring high temperature geothermal systems24 Sep 2026US 2026/0286837 A1Resman AS
- Calcium carbonate coated tracers for assessing acid stimulation operations in a hydrocarbon well24 Sep 2026US 2026/0286838 A1Chevron U.S.A.Inc.
Most cited
By later US patents
- Drilling systems with sensors for determining properties of drilling fluid downhole402US 6,176,323 B1Baker Hughes Incorporated · 2001
- Well control systems employing downhole network334US 5,959,547 ABaker Hughes Incorporated · 1999
- Method utilizing spot tracer injection and production induced transport for measurement of residual oil saturation329US 5,168,927 AShell Oil Company · 1992
- Monitoring of downhole parameters and tools utilizing fiber optics244US 6,281,489 B1Baker Hughes Incorporated · 2001
- Method for controlling production wells having permanent downhole formation evaluation sensors241US 5,597,042 ABaker Hughes Incorporated · 1997