E21B 33/12955
Using drag blocks frictionally engaging the inner wall of the well
Official title: {using drag blocks frictionally engaging the inner wall of the well}
E21B33/12955 (Using drag blocks frictionally engaging the inner wall of the well) appears on 30 US grants and 17 published applications in this corpus.
Search patents in E21B- Granted patents
- 30
- Published applications
- 17
- Assignees
- 23
- Inventors
- 56
- Latest grant
- 16 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 3 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 1 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 1 |
| 2016 | 1 | 0 |
| 2017 | 1 | 2 |
| 2018 | 1 | 2 |
| 2019 | 2 | 1 |
| 2020 | 3 | 1 |
| 2021 | 0 | 2 |
| 2022 | 1 | 2 |
| 2023 | 3 | 2 |
| 2024 | 1 | 1 |
| 2025 | 2 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
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- High expansion multi-slip frac plug with narrow cross-section6 Apr 2023US 2023/0103389 A1Lateral Completions Ltd.
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Most cited
By later US patents
- Retrievable straddle packer171US 4,590,995 AHalliburton Company · 1986
- Combination release mechanism for downhole well apparatus87US 4,437,516 ABaker International Corporation · 1984
- Method and apparatus for hydraulically firing a perforating gun below a set packer46US 4,917,187 ABaker Hughes Incorporated · 1990
- Hydraulically set and released bridge plug43US 4,646,829 AHalliburton Company · 1987
- Retrievable bridge plug and packer43US 4,928,762 AHalliburton Company · 1990