E21B 21/002
Down-hole drilling fluid separation systems
Official title: {Down-hole drilling fluid separation systems (containers comprising collecting means with a strainer E21B27/005; subsoil filtering E21B43/02; down-hole production separators E21B43/38)}
E21B21/002 (Down-hole drilling fluid separation systems) appears on 211 US grants and 169 published applications in this corpus.
Search patents in E21B- Granted patents
- 211
- Published applications
- 169
- Assignees
- 83
- Inventors
- 310
- Latest grant
- 2 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 4 | 0 |
| 1982 | 3 | 0 |
| 1983 | 2 | 0 |
| 1984 | 4 | 0 |
| 1985 | 3 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 3 | 0 |
| 1993 | 2 | 0 |
| 1994 | 3 | 0 |
| 1995 | 3 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 7 | 0 |
| 2002 | 3 | 4 |
| 2003 | 3 | 2 |
| 2004 | 4 | 8 |
| 2005 | 0 | 2 |
| 2006 | 7 | 4 |
| 2007 | 5 | 3 |
| 2008 | 3 | 2 |
| 2009 | 1 | 6 |
| 2010 | 2 | 8 |
| 2011 | 6 | 1 |
| 2012 | 4 | 8 |
| 2013 | 4 | 4 |
| 2014 | 5 | 6 |
| 2015 | 7 | 9 |
| 2016 | 6 | 4 |
| 2017 | 3 | 5 |
| 2018 | 7 | 29 |
| 2019 | 18 | 16 |
| 2020 | 20 | 12 |
| 2021 | 14 | 8 |
| 2022 | 10 | 2 |
| 2023 | 6 | 6 |
| 2024 | 6 | 8 |
| 2025 | 6 | 4 |
| 2026 | 3 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Methods of swabbing liquid loaded wells, and killing wells, with the use of compression pumps, regulators and filtration techniques2 Jun 2026US 12,644,374 B2Zenrg Services, LLC
- Fluid conditioning and/or treatment system10 Mar 2026US 12,571,269 B2Mason Specialty Tools, LLC
- Systems and methods for separating and storing downhole debris20 Jan 2026US 12,529,287 B1Halliburton Energy Services.Inc.
- Particle concentrating device, concentrator element and assembly thereof, method for increasing concentration, method for directional drilling and use of the assembly23 Sep 2025US 12,420,380 B2Canopus Drilling Solutions Holding B.V.
- Cuttings trap for “at bit” measurement of drilled cuttings16 Sep 2025US 12,416,211 B1Saudi Arabian Oil Company
- Drilling in hot zones on coiled tubing8 Oct 2026US 2026/0309004 A1Eavor Technologies Inc.
- Riser-less managed pressure drilling with subsea fluid handling1 Oct 2026US 2026/0298039 A1
- Civil engineering machine and method for forming a hole10 Sep 2026US 2026/0266018 A1BAUER Offshore Technologies GmbH
- Wireline cleaning tool13 Aug 2026US 2026/0235016 A1Welltec A/S
- Wireline cleaning tool6 Aug 2026US 2026/0226811 A1Welltec A/S
Most cited
By later US patents
- Underbalance jet pump drilling method189US 5,355,967 AUnion Oil Company of California · 1994
- Apparatus for removal of milling debris142US 6,276,452 B1Baker Hughes Incorporated · 2001
- Drill bits with polycrystalline diamond cutting elements mounted on serrated supports pressed in drill head107US 4,545,441 A1985
- Methods of downhole testing subterranean formations and associated apparatus therefor90US 6,325,146 B1Halliburton Energy Services.Inc. · 2001
- Retrievable screen device for drill pipe and the like89US 4,495,073 ABaker Oil Tools, Inc. · 1985