E21B 43/18
Repressuring or vacuum methods
E21B43/18 (Repressuring or vacuum methods) appears on 150 US grants and 72 published applications in this corpus.
Search patents in E21B- Granted patents
- 150
- Published applications
- 72
- Assignees
- 76
- Inventors
- 270
- Latest grant
- 17 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 5 | 0 |
| 1978 | 9 | 0 |
| 1979 | 3 | 0 |
| 1980 | 6 | 0 |
| 1981 | 1 | 0 |
| 1982 | 7 | 0 |
| 1983 | 6 | 0 |
| 1984 | 9 | 0 |
| 1985 | 4 | 0 |
| 1986 | 6 | 0 |
| 1987 | 4 | 0 |
| 1988 | 2 | 0 |
| 1989 | 3 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 3 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 5 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 1 |
| 2002 | 0 | 0 |
| 2003 | 1 | 1 |
| 2004 | 2 | 3 |
| 2005 | 1 | 4 |
| 2006 | 2 | 0 |
| 2007 | 3 | 1 |
| 2008 | 1 | 2 |
| 2009 | 0 | 3 |
| 2010 | 0 | 2 |
| 2011 | 3 | 2 |
| 2012 | 3 | 5 |
| 2013 | 3 | 4 |
| 2014 | 3 | 4 |
| 2015 | 3 | 5 |
| 2016 | 2 | 1 |
| 2017 | 3 | 3 |
| 2018 | 6 | 5 |
| 2019 | 5 | 5 |
| 2020 | 4 | 6 |
| 2021 | 10 | 6 |
| 2022 | 2 | 2 |
| 2023 | 1 | 2 |
| 2024 | 2 | 3 |
| 2025 | 2 | 2 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Dual well, dual pump production17 Mar 2026US 12,577,862 B2Halliburton Energy Services.Inc.
- Non-fracturing restimulation of unconventional hydrocarbon containing formations to enhance production25 Mar 2025US 12,258,846 B2Borehole Seismic, LLC.
- System for controlling performance of salt water disposal wells14 Jan 2025US 12,196,060 B2Saudi Arabian Oil Company
- Ejector manifold and subsurface process to harvest low-pressure natural gas9 Apr 2024US 11,952,877 B2Hawk Energy Solutions, LLC
- Dual well, dual pump production20 Feb 2024US 11,905,803 B2Halliburton Energy Services.Inc.
- Non-fracturing Restimulation of Unconventional Hydrocarbon Containing Formations to Enhance Production9 Oct 2025US 2025/0314162 A1Borehole Seismic, LLC.
- Method and apparatus for recovering energy8 May 2025US 2025/0146478 A1
- A method and system for remediating a wellbore21 Nov 2024US 2024/0384640 A1
- Non-fracturing Restimulation of Unconventional Hydrocarbon Containing Formations to Enhance Production15 Aug 2024US 2024/0271511 A1Borehole Seismic, LC.
- Dual well, dual pump production2 May 2024US 2024/0141765 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Recovery of hydrocarbons from coal377US 3,999,607 AExxon Research & Engineering Co. · 1976
- Recovery of oil by in situ hydrogenation343US 4,597,441 AWorld Energy Systems Incorporated · 1986
- Oil recovery method and apparatus312US 4,305,463 AOil Trieval Corporation · 1981
- Enhanced recoveries of petroleum and hydrogen from underground reservoirs310US 4,183,405 A1980
- Method for producing methane-containing gaseous mixtures305US 5,388,645 AAmoco Corporation · 1995