E21B 43/24
Using heat
Official title: using heat, e.g. steam injection
E21B43/24 (Using heat) appears on 3,287 US grants and 2,543 published applications in this corpus.
Search patents in E21B- Granted patents
- 3,287
- Published applications
- 2,543
- Assignees
- 765
- Inventors
- 4,205
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 65 | 0 |
| 1977 | 88 | 0 |
| 1978 | 103 | 0 |
| 1979 | 62 | 0 |
| 1980 | 79 | 0 |
| 1981 | 75 | 0 |
| 1982 | 43 | 0 |
| 1983 | 78 | 0 |
| 1984 | 122 | 0 |
| 1985 | 70 | 0 |
| 1986 | 55 | 0 |
| 1987 | 72 | 0 |
| 1988 | 34 | 0 |
| 1989 | 38 | 0 |
| 1990 | 44 | 0 |
| 1991 | 62 | 0 |
| 1992 | 41 | 0 |
| 1993 | 33 | 0 |
| 1994 | 33 | 0 |
| 1995 | 25 | 0 |
| 1996 | 9 | 0 |
| 1997 | 9 | 0 |
| 1998 | 15 | 0 |
| 1999 | 13 | 0 |
| 2000 | 23 | 0 |
| 2001 | 19 | 2 |
| 2002 | 9 | 81 |
| 2003 | 14 | 72 |
| 2004 | 56 | 20 |
| 2005 | 35 | 36 |
| 2006 | 59 | 30 |
| 2007 | 17 | 91 |
| 2008 | 35 | 87 |
| 2009 | 59 | 119 |
| 2010 | 70 | 133 |
| 2011 | 58 | 124 |
| 2012 | 100 | 109 |
| 2013 | 98 | 157 |
| 2014 | 117 | 199 |
| 2015 | 108 | 246 |
| 2016 | 135 | 174 |
| 2017 | 134 | 146 |
| 2018 | 145 | 122 |
| 2019 | 155 | 127 |
| 2020 | 137 | 97 |
| 2021 | 116 | 99 |
| 2022 | 82 | 80 |
| 2023 | 77 | 66 |
| 2024 | 79 | 61 |
| 2025 | 54 | 44 |
| 2026 | 28 | 21 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- E21B 43/243Combustion in situ967
- E21B 43/2401By means of electricity778
- E21B 43/2406Steam assisted gravity drainage [sagd]631
- E21B 43/2405In association with fracturing or crevice forming processes229
- E21B 43/241Combined with solution mining of non-hydrocarbon minerals47
- E21B 43/2403By means of nuclear energy22
Recent patents
- Boosting well performance in geothermal systems15 Sep 2026US 12,735,966 B2Schlumberger Technology Corporation
- Extraction and integration of waste heat from enhanced geologic hydrogen production25 Aug 2026US 12,716,339 B2Koloma, Inc.
- Systems and methods for independent control and operations of tubing and annulus at the wellhead for steam injection4 Aug 2026US 12,698,697 B1Chevron U.S.A.Inc.
- Methods of forming and maintaining conductive propped fractures in SAGD and geothermal well applications28 Jul 2026US 12,692,777 B2Halliburton Energy Services.Inc.
- Methods and systems for increasing heat transfer in geothermal systems28 Jul 2026US 12,693,046 B2GreenFire Energy Inc.
- Method for optimization of huff-n-puff gas injection in hydrocarbon reservoirs1 Oct 2026US 2026/0298060 A1Texas Tech University System
- Method and systems for cycling a geothermal well24 Sep 2026US 2026/0286819 A1Sage Geosystems Inc.
- Manipulation of fluids, fluid components and reactions in microfluidic systems10 Sep 2026US 2026/0264083 A1Brandeis University
- Microbially enhanced thermal oil recovery3 Sep 2026US 2026/0258720 A19668241 Canada Inc.
- Extraction and integration of waste heat from enhanced geologic hydrogen production13 Aug 2026US 2026/0235020 A1Koloma, Inc.
Most cited
By later US patents
- In-situ tuned microwave oil extraction process483US 5,082,054 A1992
- Method for in situ heat processing of hydrocarbonaceous formations474US 4,140,180 AIIT Research Institute · 1979
- Apparatus and method for in situ heat processing of hydrocarbonaceous formations456US 4,144,935 AIIT Research Institute · 1979
- Self-regulating heater utilizing ferrite-type body449US 5,182,427 AMetcal, Inc. · 1993
- Balanced-line RF electrode system for use in RF ground heating to recover oil from oil shale443US 5,236,039 AGeneral Electric Company · 1993