E21B 47/22
By negative mud pulses using a pressure relieve valve between drill pipe
Official title: by negative mud pulses using a pressure relieve valve between drill pipe and annulus
E21B47/22 (By negative mud pulses using a pressure relieve valve between drill pipe) appears on 113 US grants and 73 published applications in this corpus.
Search patents in E21B- Granted patents
- 113
- Published applications
- 73
- Assignees
- 31
- Inventors
- 135
- Latest grant
- 5 Sep 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 3 | 0 |
| 1984 | 1 | 0 |
| 1985 | 4 | 0 |
| 1986 | 1 | 0 |
| 1987 | 5 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 4 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 5 | 0 |
| 2001 | 3 | 0 |
| 2002 | 3 | 5 |
| 2003 | 1 | 2 |
| 2004 | 5 | 2 |
| 2005 | 1 | 1 |
| 2006 | 1 | 0 |
| 2007 | 1 | 2 |
| 2008 | 2 | 1 |
| 2009 | 1 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 2 | 5 |
| 2013 | 4 | 6 |
| 2014 | 1 | 4 |
| 2015 | 2 | 7 |
| 2016 | 3 | 6 |
| 2017 | 5 | 11 |
| 2018 | 11 | 6 |
| 2019 | 16 | 4 |
| 2020 | 5 | 6 |
| 2021 | 1 | 0 |
| 2022 | 2 | 1 |
| 2023 | 4 | 2 |
| 2024 | 0 | 0 |
| 2025 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- On demand annular pressure tool5 Sep 2023US 11,746,648 B2Saudi Arabian Oil Company
- Statorless shear valve pulse generator18 Jul 2023US 11,702,895 B2Baker Hughes Holdings LLC
- Downhole valve spanning a tool joint and methods of making and using same30 May 2023US 11,661,806 B2Bench Tree Group, LLC
- Telemetry using pulse shape modulation23 May 2023US 11,655,708 B2Halliburton Energy Services.Inc.
- Downhole valve spanning a tool joint and methods of making and using same21 Jun 2022US 11,365,596 B2Bench Tree Group, LLC
- Temperature model benchmarking in flowline environments27 Mar 2025US 2025/0101861 A1Halliburton Energy Services.Inc.
- On demand annular pressure tool11 May 2023US 2023/0146339 A1Aramco Overseas Company UK Ltd
- Downhole valve spanning a tool joint and methods of making and using same9 Feb 2023US 2023/0038419 A1Bench Tree Group, LLC
- Telemetry using pulse shape modulation31 Mar 2022US 2022/0098978 A1Halliburton Energy Services.Inc.
- Downhole valve spanning a tool joint and methods of making and using same3 Dec 2020US 2020/0378202 A1Bench Tree Group, LLC
Most cited
By later US patents
- Steerable rotary drilling systems and method of operating such systems185US 5,803,185 ACamco Drilling Group Limited of Hycalog · 1998
- Steerable rotary drilling systems185US 6,089,332 ACamco International (UK) Limited · 2000
- System and method of controlling rotation of a downhole instrument package149US 5,695,015 ACamco Drilling Group Limited of Hycalog · 1997
- Downlink telemetry system127US 6,920,085 B2Halliburton Energy Services.Inc. · 2005
- Systems, apparatus and methods for measuring while drilling125US 4,351,037 A1982