E21B 37/00
Methods or apparatus for cleaning boreholes or wells
Official title: Methods or apparatus for cleaning boreholes or wells (E21B21/00 takes precedence)
E21B37/00 (Methods or apparatus for cleaning boreholes or wells) appears on 2,320 US grants and 2,214 published applications in this corpus.
Search patents in E21B- Granted patents
- 2,320
- Published applications
- 2,214
- Assignees
- 751
- Inventors
- 4,207
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 14 | 0 |
| 1977 | 15 | 0 |
| 1978 | 11 | 0 |
| 1979 | 7 | 0 |
| 1980 | 20 | 0 |
| 1981 | 26 | 0 |
| 1982 | 10 | 0 |
| 1983 | 10 | 0 |
| 1984 | 18 | 0 |
| 1985 | 21 | 0 |
| 1986 | 21 | 0 |
| 1987 | 17 | 0 |
| 1988 | 23 | 0 |
| 1989 | 23 | 0 |
| 1990 | 20 | 0 |
| 1991 | 28 | 0 |
| 1992 | 21 | 0 |
| 1993 | 16 | 0 |
| 1994 | 31 | 0 |
| 1995 | 23 | 0 |
| 1996 | 10 | 0 |
| 1997 | 14 | 0 |
| 1998 | 23 | 0 |
| 1999 | 15 | 0 |
| 2000 | 30 | 0 |
| 2001 | 39 | 14 |
| 2002 | 30 | 27 |
| 2003 | 31 | 33 |
| 2004 | 31 | 57 |
| 2005 | 32 | 57 |
| 2006 | 43 | 36 |
| 2007 | 37 | 34 |
| 2008 | 27 | 43 |
| 2009 | 25 | 54 |
| 2010 | 38 | 62 |
| 2011 | 39 | 66 |
| 2012 | 33 | 59 |
| 2013 | 36 | 68 |
| 2014 | 41 | 96 |
| 2015 | 65 | 99 |
| 2016 | 75 | 153 |
| 2017 | 78 | 164 |
| 2018 | 124 | 156 |
| 2019 | 141 | 136 |
| 2020 | 145 | 126 |
| 2021 | 136 | 158 |
| 2022 | 128 | 123 |
| 2023 | 140 | 121 |
| 2024 | 135 | 104 |
| 2025 | 133 | 109 |
| 2026 | 71 | 59 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method of improving injection pressure and asphaltene remediation6 Oct 2026US 12,753,337 B2
- Application of organic oxidizer and enzyme combination as breaker fluid for filter cake cleanup29 Sep 2026US 12,747,385 B2Schlumberger Technology Corporation
- Corrosion-inhibiting agents for reducing dissolved oxygen concentrations within upstream oilfield systems22 Sep 2026US 12,742,111 B2Finoric, LLC
- Well mender22 Sep 2026US 12,742,365 B2
- Behind casing wash and cement22 Sep 2026US 12,742,370 B2Hydra Systems AS
- Formation Maintenance Fluids with Flowback Enhancers to Improve Wellbore Operations8 Oct 2026US 2026/0308442 A1Baker Hughes Oilfield Operations LLC
- Cleaning devices and operations for downhole separation in a well17 Sep 2026US 2026/0275820 A1Halliburton Energy Services.Inc.
- Lateral gas lift with slugging control10 Sep 2026US 2026/0266165 A1ConocoPhillips Company
- Aqueous drilling fluid for reducing bitumen accretion27 Aug 2026US 2026/0250445 A1Secure Speciality Chemicals Corp.
- Scale inhibitor composition and methods of using the same for treating scale in a wellbore20 Aug 2026US 2026/0242658 A1Saudi Arabian Oil Company
Most cited
By later US patents
- Method and apparatus for combating encroachment by in situ treated formations344US 4,576,231 ATexaco Inc. · 1986
- Well control systems employing downhole network334US 5,959,547 ABaker Hughes Incorporated · 1999
- Control system for well stimulation apparatus with response time temperature rise used in determining heater control temperature setpoint316US 5,517,593 A1996
- Well treatment251US 5,964,291 AAEA Technology plc · 1999
- Monitoring of downhole parameters and tools utilizing fiber optics244US 6,281,489 B1Baker Hughes Incorporated · 2001