E21B 36/00
Heating, cooling or insulating arrangements for boreholes or wells
Official title: Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
E21B36/00 (Heating, cooling or insulating arrangements for boreholes or wells) appears on 1,958 US grants and 1,646 published applications in this corpus.
Search patents in E21B- Granted patents
- 1,958
- Published applications
- 1,646
- Assignees
- 573
- Inventors
- 2,984
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 24 | 0 |
| 1977 | 22 | 0 |
| 1978 | 27 | 0 |
| 1979 | 18 | 0 |
| 1980 | 18 | 0 |
| 1981 | 25 | 0 |
| 1982 | 17 | 0 |
| 1983 | 48 | 0 |
| 1984 | 47 | 0 |
| 1985 | 53 | 0 |
| 1986 | 29 | 0 |
| 1987 | 37 | 0 |
| 1988 | 15 | 0 |
| 1989 | 15 | 0 |
| 1990 | 15 | 0 |
| 1991 | 26 | 0 |
| 1992 | 16 | 0 |
| 1993 | 20 | 0 |
| 1994 | 15 | 0 |
| 1995 | 10 | 0 |
| 1996 | 13 | 0 |
| 1997 | 15 | 0 |
| 1998 | 17 | 0 |
| 1999 | 14 | 0 |
| 2000 | 20 | 0 |
| 2001 | 18 | 0 |
| 2002 | 19 | 88 |
| 2003 | 20 | 43 |
| 2004 | 62 | 30 |
| 2005 | 31 | 44 |
| 2006 | 35 | 26 |
| 2007 | 19 | 48 |
| 2008 | 27 | 68 |
| 2009 | 38 | 75 |
| 2010 | 58 | 55 |
| 2011 | 37 | 58 |
| 2012 | 59 | 55 |
| 2013 | 49 | 84 |
| 2014 | 60 | 90 |
| 2015 | 66 | 126 |
| 2016 | 83 | 76 |
| 2017 | 66 | 72 |
| 2018 | 72 | 63 |
| 2019 | 71 | 78 |
| 2020 | 62 | 73 |
| 2021 | 73 | 73 |
| 2022 | 83 | 73 |
| 2023 | 70 | 72 |
| 2024 | 87 | 83 |
| 2025 | 76 | 57 |
| 2026 | 41 | 36 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- E21B 36/04Heating, cooling or insulating arrangements for boreholes or wells: using electrical heaters748
- E21B 36/001Cooling arrangements419
- E21B 36/003Insulating arrangements268
- E21B 36/02Heating, cooling or insulating arrangements for boreholes or wells: using burners220
- E21B 36/008Heating, cooling or insulating arrangements for boreholes or wells: using chemical heat171
- E21B 36/006Combined heating and pumping means96
- E21B 36/005Heater surrounding production tube84
Recent patents
- Drilling fluid conditioning systems and methods1 Sep 2026US 12,723,478 B2National Oilwell Varco, L. P.
- Extraction and integration of waste heat from enhanced geologic hydrogen production25 Aug 2026US 12,716,339 B2Koloma, Inc.
- Methods and devices for retaining conveyed heat up a wellbore18 Aug 2026US 12,709,962 B2Gradient Geothermal Inc.
- Water processing system and method4 Aug 2026US 12,698,694 B2
- Electro-hydrofracturing using electrically conductive proppants and related methods14 Jul 2026US 12,680,014 B2Eden GeoPower, Inc.
- Drilling in hot zones with a multiple tubing drill string8 Oct 2026US 2026/0309003 A1Eavor Technologies Inc.
- Temperature management of downhole tools8 Oct 2026US 2026/0309023 A1Eavor Technologies Inc.
- Pressurized tankless boiler system and appartus8 Oct 2026US 2026/0309365 A1Phoenix Heating Services
- Nested thermally insulated containers for improved heat transfer reduction24 Sep 2026US 2026/0285579 A1Hephae Energy Technology
- Manipulation of fluids, fluid components and reactions in microfluidic systems10 Sep 2026US 2026/0264083 A1Brandeis University
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