E21B 43/38
In the well
Official title: in the well
E21B43/38 (In the well) appears on 840 US grants and 720 published applications in this corpus.
Search patents in E21B- Granted patents
- 840
- Published applications
- 720
- Assignees
- 278
- Inventors
- 1,300
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 6 | 0 |
| 1979 | 1 | 0 |
| 1980 | 4 | 0 |
| 1981 | 4 | 0 |
| 1982 | 4 | 0 |
| 1983 | 7 | 0 |
| 1984 | 5 | 0 |
| 1985 | 4 | 0 |
| 1986 | 5 | 0 |
| 1987 | 4 | 0 |
| 1988 | 8 | 0 |
| 1989 | 2 | 0 |
| 1990 | 5 | 0 |
| 1991 | 3 | 0 |
| 1992 | 11 | 0 |
| 1993 | 6 | 0 |
| 1994 | 10 | 0 |
| 1995 | 8 | 0 |
| 1996 | 6 | 0 |
| 1997 | 7 | 0 |
| 1998 | 9 | 0 |
| 1999 | 16 | 0 |
| 2000 | 43 | 0 |
| 2001 | 30 | 2 |
| 2002 | 16 | 15 |
| 2003 | 11 | 18 |
| 2004 | 15 | 15 |
| 2005 | 10 | 20 |
| 2006 | 8 | 14 |
| 2007 | 11 | 6 |
| 2008 | 17 | 10 |
| 2009 | 13 | 25 |
| 2010 | 20 | 17 |
| 2011 | 12 | 20 |
| 2012 | 11 | 10 |
| 2013 | 16 | 23 |
| 2014 | 10 | 19 |
| 2015 | 22 | 23 |
| 2016 | 16 | 24 |
| 2017 | 12 | 36 |
| 2018 | 26 | 49 |
| 2019 | 43 | 50 |
| 2020 | 47 | 54 |
| 2021 | 56 | 41 |
| 2022 | 55 | 51 |
| 2023 | 45 | 48 |
| 2024 | 59 | 52 |
| 2025 | 52 | 47 |
| 2026 | 27 | 31 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Downhole filter29 Sep 2026US 12,746,488 B2Baker Hughes Oilfield Operations LLC
- Enhanced solvent recovery from tight rock and shale oil wells15 Sep 2026US 12,735,965 B2Oil Technology Group LLC
- Downhole fluid separator in re-entry multilateral well15 Sep 2026US 12,735,971 B2Halliburton Energy Services.Inc.
- Downhole fluid separator in lateral of re-entry multilateral well1 Sep 2026US 12,723,500 B2Halliburton Energy Services.Inc.
- Electrolytic pumping system25 Aug 2026US 12,716,332 B2
- Gas separator for electrical submersible pump8 Oct 2026US 2026/0309018 A1Halliburton Energy Services.Inc.
- Combined gas separation assembly1 Oct 2026US 2026/0298066 A1Blackjack Production Tools, LLC
- Retrievable, below junction, esp, and other devices24 Sep 2026US 2026/0286811 A1Halliburton Energy Services.Inc.
- Artificial lift system with annular velocity string24 Sep 2026US 2026/0286826 A1
- Cleaning devices and operations for downhole separation in a well17 Sep 2026US 2026/0275820 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Well control systems employing downhole network334US 5,959,547 ABaker Hughes Incorporated · 1999
- Electrical submersible pump and methods for enhanced utilization of electrical submersible pumps in the completion and production of wellbores267US 6,167,965 ABaker Hughes Incorporated · 2001
- Enhanced lift method and apparatus for the production of hydrocarbons204US 6,039,121 ARangewest Technologies Ltd. · 2000
- Gas-liquid separator for well pumps168US 5,482,117 AAtlantic Richfield Company · 1996
- Inhibiting effects of sloughing in wellbores164US 7,357,180 B2Shell Oil Company · 2008