E21B 49/0815
Sampling valve actuated by tubing pressure changes
Official title: {Sampling valve actuated by tubing pressure changes}
E21B49/0815 (Sampling valve actuated by tubing pressure changes) appears on 43 US grants and 29 published applications in this corpus.
Search patents in E21B- Granted patents
- 43
- Published applications
- 29
- Assignees
- 16
- Inventors
- 70
- Latest grant
- 17 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 4 | 0 |
| 2002 | 0 | 0 |
| 2003 | 2 | 1 |
| 2004 | 0 | 2 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 0 | 2 |
| 2008 | 0 | 0 |
| 2009 | 1 | 2 |
| 2010 | 0 | 1 |
| 2011 | 1 | 1 |
| 2012 | 4 | 2 |
| 2013 | 1 | 1 |
| 2014 | 0 | 1 |
| 2015 | 1 | 2 |
| 2016 | 1 | 3 |
| 2017 | 1 | 2 |
| 2018 | 2 | 1 |
| 2019 | 3 | 1 |
| 2020 | 1 | 1 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 2 | 2 |
| 2024 | 3 | 2 |
| 2025 | 1 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Downhole fluid sampling system with hydraulic actuation17 Feb 2026US 12,553,338 B2Halliburton Energy Services.Inc.
- Controlling lost circulation while drilling12 Aug 2025US 12,385,334 B2Saudi Arabian Oil Company
- Subsurface sampling tool17 Sep 2024US 12,091,969 B2Saudi Arabian Oil Company
- Controlling lost circulation while drilling18 Jun 2024US 12,012,810 B2Saudi Arabian Oil Company
- System for optimization of hydrocarbon production23 Apr 2024US 11,965,413 B2Grant Prideco, L.P.
- Downhole fluid sampling system with hydraulic actuation3 Jul 2025US 2025/0215793 A1Halliburton Energy Services.Inc.
- Controlling lost circulation while drilling25 Jul 2024US 2024/0247554 A1Saudi Arabian Oil Company
- Subsurface sampling tool6 Jun 2024US 2024/0183271 A1Saudi Arabian Oil Company
- Wellbore sampling and testing system20 Apr 2023US 2023/0117471 A1Saudi Arabian Oil Company
- Controlling lost circulation while drilling2 Mar 2023US 2023/0062054 A1Saudi Arabian Oil Company
Most cited
By later US patents
- Shut-in tools58US 5,234,057 AHalliburton Company · 1993
- Shut-in tools and method49US 5,375,658 AHalliburton Company · 1994
- Non-flashing downhole fluid sampler and method46US 6,065,355 AHalliburton Energy Services.Inc. · 2000
- Method for determining formation pressure43US 5,184,508 ALouisiana State University and Agricultural and Mechanical College · 1993
- Well fluid modular sampling apparatus42US 4,787,447 AHalliburton Company · 1988