E21B 34/101
With means for equalizing fluid pressure above and below the valve
Official title: {with means for equalizing fluid pressure above and below the valve}
E21B34/101 (With means for equalizing fluid pressure above and below the valve) appears on 191 US grants and 150 published applications in this corpus.
Search patents in E21B- Granted patents
- 191
- Published applications
- 150
- Assignees
- 59
- Inventors
- 325
- Latest grant
- 7 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 3 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 5 | 0 |
| 1984 | 5 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 4 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 3 | 0 |
| 1999 | 4 | 0 |
| 2000 | 5 | 0 |
| 2001 | 8 | 3 |
| 2002 | 1 | 2 |
| 2003 | 3 | 5 |
| 2004 | 2 | 7 |
| 2005 | 3 | 8 |
| 2006 | 3 | 6 |
| 2007 | 10 | 6 |
| 2008 | 6 | 4 |
| 2009 | 5 | 3 |
| 2010 | 6 | 4 |
| 2011 | 3 | 4 |
| 2012 | 3 | 6 |
| 2013 | 2 | 9 |
| 2014 | 5 | 3 |
| 2015 | 5 | 11 |
| 2016 | 9 | 12 |
| 2017 | 5 | 10 |
| 2018 | 8 | 7 |
| 2019 | 15 | 4 |
| 2020 | 8 | 16 |
| 2021 | 14 | 3 |
| 2022 | 5 | 7 |
| 2023 | 4 | 1 |
| 2024 | 7 | 5 |
| 2025 | 4 | 4 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Well tool actuation upon pressure decrease7 Jul 2026US 12,674,374 B2Weatherford Technology Holdings, LLC
- Tubing and control line hydrostatic-insensitive single control line safety valve9 Sep 2025US 12,410,681 B2Halliburton Energy Services.Inc.
- Deep set wireline retrievable safety valve12 Aug 2025US 12,385,355 B1Halliburton Energy Services.Inc.
- Completion plug for well completion18 Feb 2025US 12,228,008 B2Ptt Exploration and Production Public Company Limited
- Modified whipstock design integrating smart cleanout mechanisms21 Jan 2025US 12,203,369 B2Saudi Arabian Oil Company
- Well tool actuation upon pressure decrease27 Nov 2025US 2025/0361790 A1Weatherford Technology Holdings, LLC
- Hydrostatically insensitive valve assembly9 Oct 2025US 2025/0314152 A1Weatherford Technology Holdings, LLC
- Inflatable production packer with pressure relief valve assembly19 Jun 2025US 2025/0198251 A1
- Tubing and control line hydrostatic-insensitive single control line safety valve12 Jun 2025US 2025/0188817 A1Halliburton Energy Services.Inc.
- Modified whipstock design integrating smart cleanout mechanisms1 Aug 2024US 2024/0254835 A1Saudi Arabian Oil Company
Most cited
By later US patents
- Wellbore milling-- drilling166US 5,887,668 AWeatherford/Lamb, Inc. · 1999
- Multi-face whipstock with sacrificial face element85US 5,787,978 AWeatherford/Lamb, Inc. · 1998
- Bottom hole assembly85US 6,832,654 B2BJ Services Company · 2004
- Release tool for coiled tubing74US 7,249,633 B2BJ Services Company · 2007
- Equalizing means for well tools72US 4,452,311 AOtis Engineering Corporation · 1984