E21B 37/02
Scrapers specially adapted therefor
E21B37/02 (Scrapers specially adapted therefor) appears on 399 US grants and 329 published applications in this corpus.
Search patents in E21B- Granted patents
- 399
- Published applications
- 329
- Assignees
- 177
- Inventors
- 659
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 4 | 0 |
| 1981 | 6 | 0 |
| 1982 | 3 | 0 |
| 1983 | 1 | 0 |
| 1984 | 6 | 0 |
| 1985 | 6 | 0 |
| 1986 | 7 | 0 |
| 1987 | 5 | 0 |
| 1988 | 4 | 0 |
| 1989 | 4 | 0 |
| 1990 | 6 | 0 |
| 1991 | 6 | 0 |
| 1992 | 3 | 0 |
| 1993 | 3 | 0 |
| 1994 | 6 | 0 |
| 1995 | 4 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 8 | 0 |
| 1999 | 2 | 0 |
| 2000 | 5 | 0 |
| 2001 | 7 | 6 |
| 2002 | 9 | 7 |
| 2003 | 4 | 1 |
| 2004 | 7 | 9 |
| 2005 | 3 | 7 |
| 2006 | 6 | 7 |
| 2007 | 5 | 9 |
| 2008 | 3 | 8 |
| 2009 | 6 | 8 |
| 2010 | 9 | 20 |
| 2011 | 9 | 11 |
| 2012 | 10 | 8 |
| 2013 | 8 | 8 |
| 2014 | 10 | 10 |
| 2015 | 8 | 11 |
| 2016 | 11 | 22 |
| 2017 | 9 | 15 |
| 2018 | 15 | 16 |
| 2019 | 20 | 19 |
| 2020 | 21 | 20 |
| 2021 | 23 | 29 |
| 2022 | 16 | 27 |
| 2023 | 26 | 17 |
| 2024 | 21 | 15 |
| 2025 | 24 | 11 |
| 2026 | 8 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Conditioning a tubing head back pressure valve receptacle25 Aug 2026US 12,716,312 B2Saudi Arabian Oil Company
- Remotely activated multi-cycle wellbore cleaning tool12 May 2026US 12,624,614 B2Halliburton Energy Services.Inc.
- Apparatus for verifying the inner diameter of tubulars forming a tubular string21 Apr 2026US 12,607,115 B2
- Coiled tubing flexible drill rod ultra-short radius radial drilling string, system and method17 Mar 2026US 12,577,836 B2China University of Petroleum-Beijing
- Multi-functional wellbore conditioning system20 Jan 2026US 12,529,267 B2European Drilling Projects B.V.
- Completions-based well cleanout using magnetic cleanout tool30 Jul 2026US 2026/0218587 A1Halliburton Energy Services.Inc.
- Sidewall Tubular Cleaner and Sampling Tool9 Jul 2026US 2026/0193983 A1Saudi Arabian Oil Company
- Brush Tool for Well Plug and Abandonment Operations and Installation of Completion Products18 Jun 2026US 2026/0168358 A1Halliburton Energy Services.Inc.
- Scraping Tool for Well Plug and Abandonment Operations and Installation of Completion Products4 Jun 2026US 2026/0153011 A1Halliburton Energy Services.Inc.
- Multi-modal wellbore cleaning systems and associated tools30 Apr 2026US 2026/0117624 A1Specialised Energy Solutions
Most cited
By later US patents
- Method and apparatus for combating encroachment by in situ treated formations344US 4,576,231 ATexaco Inc. · 1986
- Apparatus and methods for cleaning a well128US 4,919,204 AOtis Engineering Corporation · 1990
- Method for cleaning cement plug from wellbore liner67US 5,282,509 AConoco Inc. · 1994
- Enhanced diameter clean-out tool and method57US 4,809,793 A1989
- Wellbore cleanout tool and method57US 6,883,605 B2Offshore Energy Services, Inc. · 2005