E21B 41/02
In situ inhibition of corrosion in boreholes or wells
Official title: in situ inhibition of corrosion in boreholes or wells
E21B41/02 (In situ inhibition of corrosion in boreholes or wells) appears on 604 US grants and 513 published applications in this corpus.
Search patents in E21B- Granted patents
- 604
- Published applications
- 513
- Assignees
- 233
- Inventors
- 1,213
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 12 | 0 |
| 1978 | 2 | 0 |
| 1979 | 6 | 0 |
| 1980 | 4 | 0 |
| 1981 | 4 | 0 |
| 1982 | 6 | 0 |
| 1983 | 8 | 0 |
| 1984 | 12 | 0 |
| 1985 | 9 | 0 |
| 1986 | 10 | 0 |
| 1987 | 13 | 0 |
| 1988 | 18 | 0 |
| 1989 | 16 | 0 |
| 1990 | 13 | 0 |
| 1991 | 6 | 0 |
| 1992 | 15 | 0 |
| 1993 | 10 | 0 |
| 1994 | 6 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 7 | 0 |
| 1999 | 9 | 0 |
| 2000 | 11 | 0 |
| 2001 | 10 | 3 |
| 2002 | 4 | 9 |
| 2003 | 5 | 4 |
| 2004 | 6 | 14 |
| 2005 | 5 | 4 |
| 2006 | 5 | 8 |
| 2007 | 5 | 2 |
| 2008 | 5 | 6 |
| 2009 | 1 | 7 |
| 2010 | 2 | 5 |
| 2011 | 8 | 10 |
| 2012 | 4 | 16 |
| 2013 | 10 | 20 |
| 2014 | 13 | 18 |
| 2015 | 8 | 25 |
| 2016 | 15 | 23 |
| 2017 | 17 | 48 |
| 2018 | 17 | 46 |
| 2019 | 46 | 44 |
| 2020 | 44 | 37 |
| 2021 | 31 | 25 |
| 2022 | 31 | 23 |
| 2023 | 30 | 33 |
| 2024 | 30 | 31 |
| 2025 | 26 | 31 |
| 2026 | 20 | 21 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Systems and methods for wellbore drilling utilizing a thermochemical sulfate reduction (TSR) proxy25 Aug 2026US 12,716,349 B2Saudi Arabian Oil Company
- Well clean premium (WCP-1) system and method11 Aug 2026US 12,703,823 B2Hygt Chemical LLC
- Systems and methods for scavenging sulfur-containing materials using a precursor scavenger material28 Jul 2026US 12,692,427 B2Cameron International Corporation
- Wellhead attachment device28 Jul 2026US 12,692,761 B2
- Sweetening of sour gas wells28 Jul 2026US 12,692,768 B1Saudi Arabian Oil Company
- Providing selective dissolvable coatings on a multi-shell core system for inflow control devices1 Oct 2026US 2026/0297418 A1Saudi Arabian Oil Company
- Particulate compositions for iron sulfide remediation1 Oct 2026US 2026/0297419 A1ChampionX LLC
- Corrosion inhibitor compositions and methods of use thereof27 Aug 2026US 2026/0250570 A1ChampionX LLC
- Assessing and managing the impact of subsurface scale formation on hydrocarbon recovery27 Aug 2026US 2026/0251631 A1
- Compositions and methods of removing iron sulfide scales from low pressure gas wells30 Jul 2026US 2026/0218037 A1Saudi Arabian Oil Company
Most cited
By later US patents
- Power sources for downhole electrical heating335US 5,099,918 AUentech Corporation · 1992
- Control of fine particulate flowback in subterranean wells335US 5,853,048 AHalliburton Energy Services, Inc. · 1998
- Well control systems employing downhole network334US 5,959,547 ABaker Hughes Incorporated · 1999
- Control of fine particulate flowback in subterranean wells260US 5,775,425 AHalliburton Energy Services, Inc. · 1998
- Well treatment251US 5,964,291 AAEA Technology plc · 1999