E21B 31/035
Controlling differential pipe sticking
Official title: {controlling differential pipe sticking}
E21B31/035 (Controlling differential pipe sticking) appears on 96 US grants and 56 published applications in this corpus.
Search patents in E21B- Granted patents
- 96
- Published applications
- 56
- Assignees
- 41
- Inventors
- 158
- Latest grant
- 19 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 4 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 6 | 0 |
| 1985 | 2 | 0 |
| 1986 | 4 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 3 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 3 | 0 |
| 1996 | 3 | 0 |
| 1997 | 3 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 1 |
| 2002 | 2 | 2 |
| 2003 | 2 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 2 |
| 2006 | 1 | 4 |
| 2007 | 2 | 1 |
| 2008 | 2 | 2 |
| 2009 | 1 | 0 |
| 2010 | 1 | 3 |
| 2011 | 1 | 0 |
| 2012 | 0 | 0 |
| 2013 | 1 | 1 |
| 2014 | 1 | 3 |
| 2015 | 3 | 1 |
| 2016 | 1 | 3 |
| 2017 | 2 | 0 |
| 2018 | 3 | 5 |
| 2019 | 4 | 5 |
| 2020 | 5 | 5 |
| 2021 | 6 | 4 |
| 2022 | 4 | 4 |
| 2023 | 1 | 1 |
| 2024 | 2 | 4 |
| 2025 | 2 | 3 |
| 2026 | 4 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Rotary flow control apparatus19 May 2026US 12,631,082 B1Tempress Technologies, Inc.
- Methods for freeing differentially stuck pipes12 May 2026US 12,624,271 B2Saudi Arabian Oil Company
- On demand flow pulsing system5 May 2026US 12,618,292 B2National Oilwell Varco, L. P.
- Devices and systems for drilling a wellbore21 Apr 2026US 12,607,087 B1Saudi Arabian Oil Company
- Exothermic drilling fluid composition and method of use25 Feb 2025US 12,234,704 B2Saudi Arabian Oil Company
- On demand flow pulsing system20 Aug 2026US 2026/0243134 A1National Oilwell Varco, L. P.
- Methods for freeing differentially stuck pipes25 Dec 2025US 2025/0388800 A1Saudi Arabian Oil Company
- Universal Wireline Standoff2 Oct 2025US 2025/0305373 A1
- Modified torque generator and methods of use17 Jul 2025US 2025/0230722 A1CT Energy Ltd.
- Systems for prevention of differential pipe sticking14 Nov 2024US 2024/0376789 A1Saudi Arabian Oil Company
Most cited
By later US patents
- Well casing flotation device and method259US 5,181,571 AUnion Oil Company of California · 1993
- Downhole valve for oil/gas well187US 5,499,687 A1996
- Well casing flotation device and method138US 5,117,915 AUnion Oil Company of California · 1992
- Buoyancy assisted running of perforated tubulars136US 5,456,317 A1995
- Well casing flotation device and method111US 4,986,361 AUnion Oil Company of California · 1991