E21B 33/03
Well heads
Official title: Well heads; Setting-up thereof
E21B33/03 (Well heads) appears on 6,370 US grants and 5,271 published applications in this corpus.
Search patents in E21B- Granted patents
- 6,370
- Published applications
- 5,271
- Assignees
- 1,276
- Inventors
- 7,399
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 32 | 0 |
| 1977 | 42 | 0 |
| 1978 | 56 | 0 |
| 1979 | 29 | 0 |
| 1980 | 49 | 0 |
| 1981 | 65 | 0 |
| 1982 | 64 | 0 |
| 1983 | 69 | 0 |
| 1984 | 90 | 0 |
| 1985 | 83 | 0 |
| 1986 | 81 | 0 |
| 1987 | 88 | 0 |
| 1988 | 57 | 0 |
| 1989 | 91 | 0 |
| 1990 | 84 | 0 |
| 1991 | 73 | 0 |
| 1992 | 64 | 0 |
| 1993 | 73 | 0 |
| 1994 | 67 | 0 |
| 1995 | 51 | 0 |
| 1996 | 37 | 0 |
| 1997 | 47 | 0 |
| 1998 | 67 | 0 |
| 1999 | 80 | 0 |
| 2000 | 82 | 0 |
| 2001 | 91 | 18 |
| 2002 | 81 | 88 |
| 2003 | 101 | 124 |
| 2004 | 86 | 123 |
| 2005 | 66 | 118 |
| 2006 | 113 | 101 |
| 2007 | 86 | 82 |
| 2008 | 90 | 155 |
| 2009 | 80 | 116 |
| 2010 | 106 | 176 |
| 2011 | 95 | 225 |
| 2012 | 150 | 242 |
| 2013 | 183 | 284 |
| 2014 | 236 | 284 |
| 2015 | 291 | 303 |
| 2016 | 254 | 331 |
| 2017 | 270 | 337 |
| 2018 | 308 | 322 |
| 2019 | 310 | 280 |
| 2020 | 303 | 279 |
| 2021 | 270 | 276 |
| 2022 | 267 | 239 |
| 2023 | 245 | 253 |
| 2024 | 284 | 230 |
| 2025 | 244 | 167 |
| 2026 | 139 | 118 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Systems and methods of deploying a wiper plug in a downhole tubular string6 Oct 2026US 12,753,670 B1Halliburton Energy Services.Inc.
- Seal pocket detection assembly6 Oct 2026US 12,754,339 B2FMC Technologies, Inc.
- Hydraulic spider tubular centering systems and methods for use thereof22 Sep 2026US 12,742,359 B2Forum US, Inc.
- Automatic thrust activated multi-speed reduction gear and clutch system and method22 Sep 2026US 12,742,362 B2Schlumberger Technology Corporation
- Selectively powering an electrical submersible pump assembly15 Sep 2026US 12,735,964 B2Saudi Arabian Oil Company
- Space-Out Mechanism for a Tubing Hanger and a Tree8 Oct 2026US 2026/0308996 A1Innovex International, Inc.
- Electric annular with internal motor8 Oct 2026US 2026/0308997 A1Schlumberger Technology Corporation
- Wellhead flow block and flow control mechanisms8 Oct 2026US 2026/0308998 A1Flowco MasterCo LLC
- Methods and systems for performing hydraulic fracturing operations8 Oct 2026US 2026/0309013 A1ExxonMobil Technology and Engineering Company
- Spring assist system with positional feedback for carriers of snubbing slip bowls1 Oct 2026US 2026/0298036 A1Consolidated Rig Works, L.P.
Most cited
By later US patents
- Insulated and/or concentric coiled tubing429US 6,015,015 ABJ Services Company, U.S.A. · 2000
- Downhole surge pressure reduction system and method of use340US 5,960,881 AJerry P. Allamon · 1999
- Sealed electrical conductor method and arrangement for use with a well bore in hazardous areas332US 5,289,882 A1994
- Method and apparatus for deepwater drilling283US 4,813,495 AConoco Inc. · 1989
- Sealing system for a well bore in which a hot fluid is circulated280US 4,513,816 ASociete Nationale Elf Aquitaine (Production) · 1985