E21B 19/09
Specially adapted for drilling underwater formations from a floating support using heave
Official title: specially adapted for drilling underwater formations from a floating support using heave compensators supporting the drill string
E21B19/09 (Specially adapted for drilling underwater formations from a floating support using heave) appears on 208 US grants and 134 published applications in this corpus.
Search patents in E21B- Granted patents
- 208
- Published applications
- 134
- Assignees
- 105
- Inventors
- 325
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 11 | 0 |
| 1977 | 3 | 0 |
| 1978 | 6 | 0 |
| 1979 | 2 | 0 |
| 1980 | 4 | 0 |
| 1981 | 3 | 0 |
| 1982 | 4 | 0 |
| 1983 | 4 | 0 |
| 1984 | 6 | 0 |
| 1985 | 2 | 0 |
| 1986 | 5 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 5 | 0 |
| 1990 | 2 | 0 |
| 1991 | 3 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 4 | 0 |
| 1999 | 5 | 0 |
| 2000 | 3 | 0 |
| 2001 | 3 | 1 |
| 2002 | 4 | 1 |
| 2003 | 4 | 2 |
| 2004 | 2 | 7 |
| 2005 | 4 | 7 |
| 2006 | 5 | 3 |
| 2007 | 5 | 4 |
| 2008 | 1 | 2 |
| 2009 | 2 | 4 |
| 2010 | 0 | 4 |
| 2011 | 2 | 5 |
| 2012 | 4 | 1 |
| 2013 | 2 | 3 |
| 2014 | 6 | 8 |
| 2015 | 4 | 10 |
| 2016 | 12 | 10 |
| 2017 | 7 | 15 |
| 2018 | 11 | 14 |
| 2019 | 16 | 12 |
| 2020 | 8 | 9 |
| 2021 | 5 | 3 |
| 2022 | 4 | 2 |
| 2023 | 3 | 2 |
| 2024 | 4 | 4 |
| 2025 | 2 | 0 |
| 2026 | 3 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Heave compensator enabling active heave counteraction15 Sep 2026US 12,735,302 B2Ernst-B. Johansen AS
- Multi-purpose compensator system14 Apr 2026US 12,601,229 B1Advanced Tool & Supply, LLC
- System and method for improved heave compensation24 Mar 2026US 12,584,534 B2Grant Prideco, L.P.
- Offshore drilling apparatus and methods30 Sep 2025US 12,428,918 B2Expro North Sea Limited
- Multi-purpose compensator system18 Feb 2025US 12,227,998 B1Advanced Tool & Supply, LLC
- System and method for improved heave compensation2 Jul 2026US 2026/0185586 A1Grant Prideco, L.P.
- Open cantilever tension system5 Dec 2024US 2024/0401416 A1Schlumberger Technology Corporation
- Offshore drilling apparatus and methods17 Oct 2024US 2024/0344407 A1Deltatek Oil Tools Limited
- Compensating rig elevator13 Jun 2024US 2024/0191584 A1
- Tubular compensation system28 Mar 2024US 2024/0102348 A1
Most cited
By later US patents
- Subsea wellbore drilling system for reducing bottom hole pressure97US 6,415,877 B1Deep Vision Inc. · 2002
- Riser tensioner system for use on offshore platforms using elastomeric pads or helical metal compression springs81US 5,366,324 ALTV Energy Products Company · 1994
- System and method for managing heave pressure from a floating rig73US 8,347,982 B2Weatherford/Lamb, Inc. · 2013
- Semi-active heave compensation system for marine vessels66US 5,209,302 ARetsco, Inc. · 1993
- Tubing injection systems for oilfield operations65US 6,276,454 B1Baker Hughes Incorporated · 2001