E21B 17/20
Flexible or articulated drilling pipes
Official title: Flexible or articulated drilling pipes {, e.g. flexible or articulated rods, pipes or cables}
E21B17/20 (Flexible or articulated drilling pipes) appears on 1,020 US grants and 941 published applications in this corpus.
Search patents in E21B- Granted patents
- 1,020
- Published applications
- 941
- Assignees
- 401
- Inventors
- 1,739
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 6 | 0 |
| 1978 | 2 | 0 |
| 1979 | 9 | 0 |
| 1980 | 4 | 0 |
| 1981 | 3 | 0 |
| 1982 | 6 | 0 |
| 1983 | 4 | 0 |
| 1984 | 8 | 0 |
| 1985 | 3 | 0 |
| 1986 | 10 | 0 |
| 1987 | 4 | 0 |
| 1988 | 5 | 0 |
| 1989 | 11 | 0 |
| 1990 | 13 | 0 |
| 1991 | 3 | 0 |
| 1992 | 19 | 0 |
| 1993 | 10 | 0 |
| 1994 | 13 | 0 |
| 1995 | 18 | 0 |
| 1996 | 18 | 0 |
| 1997 | 9 | 0 |
| 1998 | 10 | 0 |
| 1999 | 26 | 0 |
| 2000 | 20 | 0 |
| 2001 | 24 | 7 |
| 2002 | 27 | 24 |
| 2003 | 27 | 31 |
| 2004 | 17 | 32 |
| 2005 | 17 | 26 |
| 2006 | 22 | 20 |
| 2007 | 19 | 14 |
| 2008 | 9 | 22 |
| 2009 | 14 | 20 |
| 2010 | 23 | 42 |
| 2011 | 10 | 26 |
| 2012 | 20 | 29 |
| 2013 | 24 | 30 |
| 2014 | 20 | 43 |
| 2015 | 33 | 77 |
| 2016 | 39 | 73 |
| 2017 | 63 | 83 |
| 2018 | 60 | 62 |
| 2019 | 56 | 56 |
| 2020 | 52 | 48 |
| 2021 | 46 | 48 |
| 2022 | 47 | 32 |
| 2023 | 40 | 24 |
| 2024 | 30 | 23 |
| 2025 | 23 | 32 |
| 2026 | 21 | 17 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method of forming and heat treating coiled tubing22 Sep 2026US 12,742,232 B2Tenaris Coiled Tubes, LLC
- Selectively powering an electrical submersible pump assembly15 Sep 2026US 12,735,964 B2Saudi Arabian Oil Company
- Composite umbilical for pulse power boring system25 Aug 2026US 12,716,297 B2Halliburton Energy Services.Inc.
- Bottomhole assembly for geothermal field construction25 Aug 2026US 12,716,345 B2Bedrock Energy, Inc.
- Insulated coiled tubing for pulsed power drilling4 Aug 2026US 12,698,684 B2Halliburton Energy Services.Inc.
- Drilling in hot zones with a multiple tubing drill string8 Oct 2026US 2026/0309003 A1Eavor Technologies Inc.
- Drilling in hot zones on coiled tubing8 Oct 2026US 2026/0309004 A1Eavor Technologies Inc.
- Systems and methods for coiled tubing drilling10 Sep 2026US 2026/0266148 A1Schlumberger Technology Corporation
- Coiled tubing systems and methods including separate coiled tubing strings27 Aug 2026US 2026/0251021 A1EOG Resources, Inc.
- Composite umbilical for pulse power boring system16 Jul 2026US 2026/0201753 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Flexible drill pipe1,497US 4,328,839 ADrilling Development, Inc. · 1982
- Flexible drill pipe1,412US 4,600,037 ATexas Eastern Drilling Systems, Inc. · 1986
- Insulated and/or concentric coiled tubing429US 6,015,015 ABJ Services Company, U.S.A. · 2000
- Heater utilizing copper-nickel alloy core349US 5,060,287 AShell Oil Company · 1991
- Process of electric pipeline heating utilizing heating elements inserted in pipelines288US 5,182,792 APetroleo Brasileiro S.A. - Petrobras · 1993