E21B 49/0813
Sampling valve actuated by annulus pressure changes
Official title: {Sampling valve actuated by annulus pressure changes}
E21B49/0813 (Sampling valve actuated by annulus pressure changes) appears on 51 US grants and 29 published applications in this corpus.
Search patents in E21B- Granted patents
- 51
- Published applications
- 29
- Assignees
- 12
- Inventors
- 81
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 4 | 0 |
| 2002 | 1 | 2 |
| 2003 | 1 | 1 |
| 2004 | 2 | 2 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 1 | 2 |
| 2008 | 0 | 3 |
| 2009 | 2 | 6 |
| 2010 | 3 | 0 |
| 2011 | 6 | 2 |
| 2012 | 0 | 0 |
| 2013 | 1 | 1 |
| 2014 | 2 | 2 |
| 2015 | 2 | 2 |
| 2016 | 1 | 2 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 1 | 0 |
| 2020 | 1 | 1 |
| 2021 | 2 | 1 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 1 | 1 |
| 2025 | 0 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Sampling through perforation guns with flushing28 Jul 2026US 12,692,786 B2Schlumberger Technology Corporation
- Subsurface sampling tool17 Sep 2024US 12,091,969 B2Saudi Arabian Oil Company
- Closed chamber impulse test with downhole flow rate measurement19 Oct 2021US 11,149,545 B2Schlumberger Technology Corporation
- Acoustic testing of core samples16 Feb 2021US 10,920,574 B1Saudi Arabian Oil Company
- Acoustic testing of core samples1 Dec 2020US 10,851,641 B2Saudi Arabian Oil Company
- Sampling through perforation guns with flushing13 Nov 2025US 2025/0347223 A1Schlumberger Technology Corporation
- Subsurface sampling tool6 Jun 2024US 2024/0183271 A1Saudi Arabian Oil Company
- Acoustic testing of core samples4 Feb 2021US 2021/0032977 A1Saudi Arabian Oil Company
- Acoustic testing of core samples5 Mar 2020US 2020/0072039 A1Saudi Arabian Oil Company
- Key seal and valve24 Nov 2016US 2016/0341314 A1Proserv Operations, Inc.
Most cited
By later US patents
- Reclosable circulation valve for use in oil well testing82US 4,113,012 AHalliburton Company · 1978
- Full bore sampler valve77US 4,576,234 ASchlumberger Technology Corporation · 1986
- Method and apparatus for annulus pressure responsive circulation and tester valve manipulation59US 3,970,147 AHalliburton Company · 1976
- Full-opening annulus pressure operated sampler valve with reverse circulation valve57US 4,063,593 AHalliburton Company · 1977
- Open hole formation testing52US 6,622,554 B2Halliburton Energy Services.Inc. · 2003