E21B 21/019
Arrangements for maintaining circulation of drilling fluid while connecting or disconnecting tubular
Official title: {Arrangements for maintaining circulation of drilling fluid while connecting or disconnecting tubular joints}
E21B21/019 (Arrangements for maintaining circulation of drilling fluid while connecting or disconnecting tubular) appears on 115 US grants and 116 published applications in this corpus.
Search patents in E21B- Granted patents
- 115
- Published applications
- 116
- Assignees
- 47
- Inventors
- 157
- Latest grant
- 28 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 0 |
| 2002 | 3 | 3 |
| 2003 | 4 | 3 |
| 2004 | 3 | 4 |
| 2005 | 0 | 2 |
| 2006 | 5 | 6 |
| 2007 | 4 | 1 |
| 2008 | 3 | 0 |
| 2009 | 0 | 10 |
| 2010 | 2 | 10 |
| 2011 | 2 | 3 |
| 2012 | 8 | 6 |
| 2013 | 5 | 5 |
| 2014 | 9 | 11 |
| 2015 | 4 | 10 |
| 2016 | 9 | 11 |
| 2017 | 8 | 6 |
| 2018 | 6 | 5 |
| 2019 | 10 | 1 |
| 2020 | 7 | 6 |
| 2021 | 3 | 4 |
| 2022 | 4 | 3 |
| 2023 | 2 | 1 |
| 2024 | 2 | 2 |
| 2025 | 2 | 1 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Pressure management device for drilling system28 Apr 2026US 12,612,840 B2Citadel Drilling Ltd.
- Valve and a method of controlling fluid flow between a fluid supplying device and a fluid receiving device13 Jan 2026US 12,523,317 B2MH Tech AS
- Openhole logging tool integrating wellbore fluids treatment system and method of use11 Nov 2025US 12,467,323 B2Saudi Arabian Oil Company
- Robotic system for continuous circulation for a drilling operation16 Sep 2025US 12,416,208 B1Halliburton Energy Services.Inc.
- Pressure management device for drilling system17 Sep 2024US 12,091,934 B2Opla Energy Ltd.
- An extensible tubing and a method of facilitating transfer of fluid27 Aug 2026US 2026/0251026 A1MH Tech AS
- Flow diversion in managed pressure drilling operations9 Jul 2026US 2026/0193948 A1
- Openhole logging tool integrating wellbore fluids treatment system and method of use28 Aug 2025US 2025/0270886 A1Saudi Arabian Oil Company
- Pressure management device for drilling system12 Dec 2024US 2024/0410250 A1Opla Energy Ltd.
- A valve and a method of controlling fluid flow between a fluid supplying device and a fluid receiving device13 Jun 2024US 2024/0191811 A1MH Tech AS
Most cited
By later US patents
- Circulation tool193US 6,253,861 B1Specialised Petroleum Services Limited · 2001
- Continuous flow cylinder for maintaining drilling fluid circulation while connecting drill string joints137US 6,119,772 A2000
- Wellbore circulation system136US 6,412,554 B1Weatherford/Lamb, Inc. · 2002
- Continuous circulation apparatus for air drilling well bore operations118US 4,315,553 A1982
- Continuous circulation drilling method109US 6,315,051 B1Coupler Developments Limited · 2001