E21B 43/247
In association with fracturing processes or crevice forming processes
Official title: in association with fracturing processes {or crevice forming processes}
E21B43/247 (In association with fracturing processes or crevice forming processes) appears on 501 US grants and 249 published applications in this corpus.
Search patents in E21B- Granted patents
- 501
- Published applications
- 249
- Assignees
- 92
- Inventors
- 461
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 21 | 0 |
| 1978 | 36 | 0 |
| 1979 | 31 | 0 |
| 1980 | 35 | 0 |
| 1981 | 39 | 0 |
| 1982 | 20 | 0 |
| 1983 | 25 | 0 |
| 1984 | 39 | 0 |
| 1985 | 13 | 0 |
| 1986 | 4 | 0 |
| 1987 | 5 | 0 |
| 1988 | 3 | 0 |
| 1989 | 0 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 1 |
| 2002 | 0 | 74 |
| 2003 | 7 | 44 |
| 2004 | 45 | 5 |
| 2005 | 28 | 2 |
| 2006 | 30 | 2 |
| 2007 | 5 | 8 |
| 2008 | 2 | 4 |
| 2009 | 3 | 3 |
| 2010 | 6 | 7 |
| 2011 | 2 | 3 |
| 2012 | 4 | 2 |
| 2013 | 4 | 4 |
| 2014 | 5 | 8 |
| 2015 | 6 | 12 |
| 2016 | 5 | 8 |
| 2017 | 6 | 5 |
| 2018 | 8 | 8 |
| 2019 | 8 | 9 |
| 2020 | 7 | 7 |
| 2021 | 9 | 7 |
| 2022 | 5 | 7 |
| 2023 | 8 | 4 |
| 2024 | 3 | 8 |
| 2025 | 5 | 5 |
| 2026 | 3 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Boosting well performance in geothermal systems15 Sep 2026US 12,735,966 B2Schlumberger Technology Corporation
- Methods of generating hydrogen in high-temperature, tight subterranean formations10 Mar 2026US 12,571,290 B2Halliburton Energy Services.Inc.
- Systems and methods of initiating energetic reactions for reservoir stimulation24 Feb 2026US 12,560,066 B2Schlumberger Technology Corporation
- Self-generating heat process for in-situ conversion of medium-low mature and organic-rich shale17 Jun 2025US 12,331,620 B2Jilin University
- Oil production system and method10 Jun 2025US 12,326,072 B2
- Method for synergistic permeability enhancement and extraction of coal mine gas23 Jul 2026US 2026/0210224 A1Chongqing University
- System and method for enhanced geothermal energy extraction16 Jul 2026US 2026/0201783 A1Hunt Energy, L.L.C.
- Well selection methodology for the deployment of in-situ shock wave stimulation processes in carbonate reservoirs30 Oct 2025US 2025/0334035 A1Saudi Arabian Oil Company
- Robust Plasma Blast Probe Apparatus and Method18 Sep 2025US 2025/0290414 A1Petram Technologies, Inc.
- Oil Production System and Method28 Aug 2025US 2025/0270911 A1
Most cited
By later US patents
- Recovery of hydrocarbons from coal377US 3,999,607 AExxon Research & Engineering Co. · 1976
- Apparatus and method for the recovery of fuel products from subterranean deposits of carbonaceous matter using a plasma arc377US 4,067,390 ATechnology Application Services Corporation · 1978
- Producing methane from coal in situ351US 4,089,374 AIn Situ Technology, Inc. · 1978
- In situ recovery from a kerogen and liquid hydrocarbon containing formation332US 7,011,154 B2Shell Oil Company · 2006
- Generating electricity from coal in situ328US 4,250,230 AIn Situ Technology, Inc. · 1981