E21B 37/08
Cleaning in situ of down-hole filters, screens
Official title: cleaning in situ of down-hole filters, screens, {e.g. casing perforations,} or gravel packs (E21B37/06 takes precedence)
E21B37/08 (Cleaning in situ of down-hole filters, screens) appears on 287 US grants and 180 published applications in this corpus.
Search patents in E21B- Granted patents
- 287
- Published applications
- 180
- Assignees
- 116
- Inventors
- 476
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 6 | 0 |
| 1978 | 3 | 0 |
| 1979 | 4 | 0 |
| 1980 | 9 | 0 |
| 1981 | 12 | 0 |
| 1982 | 4 | 0 |
| 1983 | 5 | 0 |
| 1984 | 4 | 0 |
| 1985 | 7 | 0 |
| 1986 | 3 | 0 |
| 1987 | 3 | 0 |
| 1988 | 6 | 0 |
| 1989 | 3 | 0 |
| 1990 | 7 | 0 |
| 1991 | 6 | 0 |
| 1992 | 3 | 0 |
| 1993 | 2 | 0 |
| 1994 | 7 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 4 | 0 |
| 1999 | 3 | 0 |
| 2000 | 10 | 0 |
| 2001 | 3 | 1 |
| 2002 | 5 | 4 |
| 2003 | 6 | 2 |
| 2004 | 4 | 9 |
| 2005 | 5 | 5 |
| 2006 | 3 | 7 |
| 2007 | 8 | 4 |
| 2008 | 4 | 8 |
| 2009 | 4 | 5 |
| 2010 | 6 | 4 |
| 2011 | 3 | 3 |
| 2012 | 6 | 7 |
| 2013 | 4 | 7 |
| 2014 | 1 | 7 |
| 2015 | 4 | 8 |
| 2016 | 5 | 10 |
| 2017 | 6 | 10 |
| 2018 | 6 | 9 |
| 2019 | 14 | 14 |
| 2020 | 6 | 9 |
| 2021 | 12 | 16 |
| 2022 | 13 | 9 |
| 2023 | 15 | 10 |
| 2024 | 13 | 7 |
| 2025 | 9 | 5 |
| 2026 | 5 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Behind casing wash and cement22 Sep 2026US 12,742,370 B2Hydra Systems AS
- Encapsulated internal filter cake breaker30 Jun 2026US 12,669,033 B2
- Assessing and remediating well clogging from precipitate, systems, apparatuses, and methods23 Jun 2026US 12,662,903 B1Sevee & Maher Engineers, Inc.
- Debris removal apparatus with self cleaning filter assembly, well system and method of use17 Feb 2026US 12,553,314 B2Halliburton Energy Services.Inc.
- Devices, systems, and methods for a cleaning element3 Feb 2026US 12,540,528 B2Schlumberger Technology Corporation
- Devices, systems, and methods for a cleaning element10 Jul 2025US 2025/0223887 A1Schlumberger Technology Corporation
- Implosion device22 May 2025US 2025/0163778 A1Schlumberger Technology Corporation
- Behind casing wash and cement20 Mar 2025US 2025/0092762 A1ConocoPhillips Company
- Pump control framework20 Mar 2025US 2025/0092770 A1Schlumberger Technology Corporation
- Encapsulated internal filter cake breaker20 Feb 2025US 2025/0059854 A1Baker Hughes Oilfield Operations LLC
Most cited
By later US patents
- Well completions using casing valves191US 4,949,788 AHalliburton Company · 1990
- One trip backwash/sand control system with extendable washpipe isolation162US 5,413,180 AHalliburton Company · 1995
- Apparatus and method for perforating and stimulating a subterranean formation156US 5,775,426 AMarathon Oil Company · 1998
- Hydraulic setting sleeve145US 5,375,662 AHalliburton Company · 1994
- Continuous flow perforation washing tool and method138US 4,519,456 AHughes Tool Company · 1985