E21B 43/40
Separation associated with re-injection of separated materials
Official title: Separation associated with re-injection of separated materials {(E21B43/385 takes precedence)}
E21B43/40 (Separation associated with re-injection of separated materials) appears on 566 US grants and 434 published applications in this corpus.
Search patents in E21B- Granted patents
- 566
- Published applications
- 434
- Assignees
- 303
- Inventors
- 1,112
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 12 | 0 |
| 1978 | 12 | 0 |
| 1979 | 6 | 0 |
| 1980 | 5 | 0 |
| 1981 | 9 | 0 |
| 1982 | 16 | 0 |
| 1983 | 22 | 0 |
| 1984 | 17 | 0 |
| 1985 | 16 | 0 |
| 1986 | 5 | 0 |
| 1987 | 14 | 0 |
| 1988 | 13 | 0 |
| 1989 | 12 | 0 |
| 1990 | 6 | 0 |
| 1991 | 6 | 0 |
| 1992 | 14 | 0 |
| 1993 | 6 | 0 |
| 1994 | 4 | 0 |
| 1995 | 9 | 0 |
| 1996 | 6 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 3 | 0 |
| 2000 | 7 | 0 |
| 2001 | 4 | 1 |
| 2002 | 3 | 2 |
| 2003 | 3 | 6 |
| 2004 | 2 | 0 |
| 2005 | 1 | 8 |
| 2006 | 2 | 6 |
| 2007 | 2 | 9 |
| 2008 | 3 | 10 |
| 2009 | 5 | 6 |
| 2010 | 13 | 13 |
| 2011 | 7 | 15 |
| 2012 | 5 | 22 |
| 2013 | 13 | 18 |
| 2014 | 19 | 30 |
| 2015 | 20 | 50 |
| 2016 | 21 | 28 |
| 2017 | 18 | 32 |
| 2018 | 24 | 21 |
| 2019 | 36 | 23 |
| 2020 | 22 | 21 |
| 2021 | 17 | 21 |
| 2022 | 22 | 25 |
| 2023 | 27 | 22 |
| 2024 | 24 | 18 |
| 2025 | 16 | 19 |
| 2026 | 5 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Produced water degassing using ejector6 Oct 2026US 12,753,686 B1Saudi Arabian Oil Company
- Devices, systems, and methods for gas lift gas12 May 2026US 12,624,619 B2Liftrock LLC
- System, method and apparatus for generating electric power from subsurface wells17 Mar 2026US 12,577,853 B2
- Dual well, dual pump production17 Mar 2026US 12,577,862 B2Halliburton Energy Services.Inc.
- Method for creating crude oil synthesized fluid having surfactant and demulsification properties6 Jan 2026US 12,516,253 B2Lteoil LLC
- Devices, systems, and methods for gas lift gas27 Aug 2026US 2026/0251039 A1Liftrock LLC
- Enhanced solvent recovery from tight rock and shale oil wells30 Jul 2026US 2026/0218594 A1Oil Technology Group LLC
- Methods, systems, and compositions for in-situ foam generation for liquid unloading23 Jul 2026US 2026/0209595 A1Saudi Arabian Oil Company
- System, Method and Apparatus for Generating Electric Power from Subsurface Wells23 Jul 2026US 2026/0210211 A1
- Device for deep liquid production through downhole pressure-boosting jet and use method9 Jul 2026US 2026/0193968 A1
Most cited
By later US patents
- Recovery of hydrocarbons from coal377US 3,999,607 AExxon Research & Engineering Co. · 1976
- Production of synthetic crude oil from heavy hydrocarbons recovered by in situ hydrovisbreaking351US 6,016,868 AWorld Energy Systems Incorporated · 2000
- Generating electricity from coal in situ328US 4,250,230 AIn Situ Technology, Inc. · 1981
- Heavy oil recovery process320US 4,706,751 AS-Cal Research Corp. · 1987
- In situ retorting of oil shale with pulsed water purge317US 4,637,464 AAmoco Corporation · 1987