E21B 33/047
For plural tubing strings
Official title: for plural tubing strings
E21B33/047 (For plural tubing strings) appears on 259 US grants and 169 published applications in this corpus.
Search patents in E21B- Granted patents
- 259
- Published applications
- 169
- Assignees
- 92
- Inventors
- 297
- Latest grant
- 21 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 1 | 0 |
| 1978 | 5 | 0 |
| 1979 | 0 | 0 |
| 1980 | 3 | 0 |
| 1981 | 10 | 0 |
| 1982 | 6 | 0 |
| 1983 | 4 | 0 |
| 1984 | 4 | 0 |
| 1985 | 2 | 0 |
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 3 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 3 | 0 |
| 1996 | 4 | 0 |
| 1997 | 4 | 0 |
| 1998 | 5 | 0 |
| 1999 | 5 | 0 |
| 2000 | 9 | 0 |
| 2001 | 7 | 0 |
| 2002 | 6 | 10 |
| 2003 | 11 | 15 |
| 2004 | 8 | 15 |
| 2005 | 4 | 20 |
| 2006 | 19 | 6 |
| 2007 | 18 | 5 |
| 2008 | 8 | 5 |
| 2009 | 5 | 9 |
| 2010 | 3 | 6 |
| 2011 | 7 | 13 |
| 2012 | 10 | 8 |
| 2013 | 6 | 7 |
| 2014 | 10 | 8 |
| 2015 | 5 | 5 |
| 2016 | 6 | 6 |
| 2017 | 10 | 5 |
| 2018 | 4 | 3 |
| 2019 | 5 | 2 |
| 2020 | 3 | 4 |
| 2021 | 2 | 4 |
| 2022 | 4 | 5 |
| 2023 | 3 | 2 |
| 2024 | 3 | 4 |
| 2025 | 4 | 0 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Wellhead attachment system21 Apr 2026US 12,607,083 B2Vault Pressure Control LLC
- Methods for producing a geothermal well5 Aug 2025US 12,378,869 B2Schlumberger Technology Corporation
- Split hanger tubing hanger3 Jun 2025US 12,320,223 B2Innovex Downhole Solutions, Inc.
- Spool-type pitless adapter for groundwater heat exchanger20 May 2025US 12,305,467 B2Darcy Solutions, Inc.
- Flow path and bore management system and method15 Apr 2025US 12,276,177 B2OneSubsea IP UK Limited
- Wellhead attachment system30 Jul 2026US 2026/0218583 A1Vault Pressure Control LLC
- Insert for dual string hanger assembly11 Jun 2026US 2026/0160144 A1
- Protecting the casing-casing annulus in hydrocarbon producing wellbores7 Nov 2024US 2024/0368961 A1Saudi Arabian Oil Company
- Flow path and bore management system and method31 Oct 2024US 2024/0360738 A1OneSubsea IP UK Limited
- Methods for producing a geothermal well26 Sep 2024US 2024/0318537 A1Schlumberger Technology Corporation
Most cited
By later US patents
- Insulated and/or concentric coiled tubing429US 6,015,015 ABJ Services Company, U.S.A. · 2000
- Wellhead138US 5,544,707 ACooper Cameron Corporation · 1996
- Slimbore subsea completion system and method131US 6,227,300 B1FMC Corporation · 2001
- Method and apparatus for remote installations of dual tubing strings in a subsea well129US 4,474,236 ACameron Iron Works, Inc. · 1984
- Parallel seal assembly123US 5,472,048 ABaker Hughes Incorporated · 1995