E21B 23/04
Operated by fluid means
Official title: operated by fluid means, e.g. actuated by explosion (E21B23/08 takes precedence)
E21B23/04 (Operated by fluid means) appears on 1,758 US grants and 1,483 published applications in this corpus.
Search patents in E21B- Granted patents
- 1,758
- Published applications
- 1,483
- Assignees
- 442
- Inventors
- 2,330
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 5 | 0 |
| 1978 | 7 | 0 |
| 1979 | 4 | 0 |
| 1980 | 5 | 0 |
| 1981 | 18 | 0 |
| 1982 | 9 | 0 |
| 1983 | 9 | 0 |
| 1984 | 5 | 0 |
| 1985 | 11 | 0 |
| 1986 | 7 | 0 |
| 1987 | 15 | 0 |
| 1988 | 14 | 0 |
| 1989 | 18 | 0 |
| 1990 | 11 | 0 |
| 1991 | 14 | 0 |
| 1992 | 17 | 0 |
| 1993 | 24 | 0 |
| 1994 | 22 | 0 |
| 1995 | 26 | 0 |
| 1996 | 26 | 0 |
| 1997 | 11 | 0 |
| 1998 | 30 | 0 |
| 1999 | 23 | 0 |
| 2000 | 27 | 0 |
| 2001 | 37 | 9 |
| 2002 | 36 | 28 |
| 2003 | 26 | 30 |
| 2004 | 18 | 33 |
| 2005 | 17 | 33 |
| 2006 | 35 | 11 |
| 2007 | 18 | 29 |
| 2008 | 20 | 28 |
| 2009 | 26 | 37 |
| 2010 | 17 | 63 |
| 2011 | 29 | 51 |
| 2012 | 43 | 58 |
| 2013 | 46 | 59 |
| 2014 | 59 | 86 |
| 2015 | 70 | 83 |
| 2016 | 74 | 66 |
| 2017 | 69 | 52 |
| 2018 | 68 | 58 |
| 2019 | 59 | 53 |
| 2020 | 59 | 100 |
| 2021 | 97 | 101 |
| 2022 | 94 | 118 |
| 2023 | 93 | 98 |
| 2024 | 114 | 97 |
| 2025 | 114 | 73 |
| 2026 | 56 | 29 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- E21B 23/042Using a single piston or multiple mechanically interconnected pistons663
- E21B 23/0411Specially adapted for anchoring tools or the like to the borehole wall387
- E21B 23/0419Using down-hole motor and pump arrangements for generating hydraulic pressure242
- E21B 23/0412Characterised by pressure chambers226
- E21B 23/0413Using means for blocking fluid flow185
- E21B 23/0414Using explosives152
- E21B 23/0418Specially adapted for locking the tools in landing nipples or recesses82
- E21B 23/0415Using particular fluids80
Recent patents
- Downhole tool including related lug slots and lugs for coupling a milling tool and whipstock assembly6 Oct 2026US 12,753,666 B2Halliburton Energy Services.Inc.
- Method of creating an annular zonal isolation seal in a downhole annulus6 Oct 2026US 12,753,679 B2Shell USA, Inc.
- Downhole tool system comprising hydraulically actuated shifting assembly and related methods22 Sep 2026US 12,742,368 B2Kobold Corporation
- Hydraulic lock apparatus8 Sep 2026US 12,729,603 B2Welleng Science and Technology Ltd.
- Downhole system for conveying an explosive tool within a wellbore and reducing damage to other tools of the downhole system1 Sep 2026US 12,723,480 B2
- Downhole tool including a pressure intensifier1 Oct 2026US 2026/0298043 A1Halliburton Energy Services.Inc.
- Dual-Booster Power Charge24 Sep 2026US 2026/0286796 A1DBK Industries, LLC
- Perforating tool with a hydraulically actuated assembly24 Sep 2026US 2026/0286813 A1Saudi Arabian Oil Company
- Apparatus and methods for operating downhole tools10 Sep 2026US 2026/0266151 A1Wellbore Integrity Solutions LLC
- Hydraulically actuated connection for downhole tools10 Sep 2026US 2026/0266152 A1Wellbore Integrity Solutions LLC
Most cited
By later US patents
- Diamond thrust bearing and method for manufacturing same434US 5,092,687 AAnadrill, Inc. · 1992
- Thermally-enhanced oil recovery method and apparatus399US 4,694,907 ACarbotek, Inc. · 1987
- Well drilling tool with diamond radial/thrust bearings383US 4,410,054 AMaurer Engineering Inc. · 1983
- Rotary drill bit including polycrystalline diamond cutting elements320US 7,866,418 B2US Synthetic Corporation · 2011
- Diamond bearing assembly291US 5,368,398 ACsir · 1994