E21B 44/005
Below-ground automatic control systems
Official title: {Below-ground automatic control systems}
E21B44/005 (Below-ground automatic control systems) appears on 593 US grants and 486 published applications in this corpus.
Search patents in E21B- Granted patents
- 593
- Published applications
- 486
- Assignees
- 180
- Inventors
- 991
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 4 | 0 |
| 1981 | 5 | 0 |
| 1982 | 0 | 0 |
| 1983 | 3 | 0 |
| 1984 | 6 | 0 |
| 1985 | 6 | 0 |
| 1986 | 4 | 0 |
| 1987 | 5 | 0 |
| 1988 | 5 | 0 |
| 1989 | 9 | 0 |
| 1990 | 7 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 8 | 0 |
| 1994 | 8 | 0 |
| 1995 | 7 | 0 |
| 1996 | 3 | 0 |
| 1997 | 5 | 0 |
| 1998 | 7 | 0 |
| 1999 | 8 | 0 |
| 2000 | 18 | 0 |
| 2001 | 17 | 5 |
| 2002 | 18 | 8 |
| 2003 | 8 | 9 |
| 2004 | 5 | 17 |
| 2005 | 7 | 10 |
| 2006 | 10 | 6 |
| 2007 | 11 | 5 |
| 2008 | 5 | 13 |
| 2009 | 6 | 6 |
| 2010 | 3 | 10 |
| 2011 | 6 | 9 |
| 2012 | 9 | 13 |
| 2013 | 12 | 14 |
| 2014 | 11 | 25 |
| 2015 | 16 | 40 |
| 2016 | 25 | 39 |
| 2017 | 25 | 37 |
| 2018 | 37 | 36 |
| 2019 | 45 | 43 |
| 2020 | 43 | 34 |
| 2021 | 46 | 27 |
| 2022 | 22 | 18 |
| 2023 | 20 | 23 |
| 2024 | 22 | 22 |
| 2025 | 26 | 11 |
| 2026 | 14 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Integrating ethernet technology within drilling systems6 Oct 2026US 12,753,688 B2Schlumberger Technology Corporation
- Interference compensated cross-axial magnetometer measurements22 Sep 2026US 12,742,380 B2Schlumberger Technology Corporation
- Selectively powering an electrical submersible pump assembly15 Sep 2026US 12,735,964 B2Saudi Arabian Oil Company
- Automatic steering instructions for directional motor drilling25 Aug 2026US RE51,013 E1Nabors Drilling Technologies USA, Inc.
- High temperature superconducting cable based power delivery system in pulsed power drilling11 Aug 2026US 12,704,024 B2Halliburton Energy Services.Inc.
- Intelligent traction systems and control methods thereof10 Sep 2026US 2026/0266170 A1Chengdu University of Technology
- Selectively powering an electrical submersible pump assembly2 Jul 2026US 2026/0185429 A1Saudi Arabian Oil Company
- Mitigating torsional drill string oscillations12 Mar 2026US 2026/0071536 A1Schlumberger Technology Corporation
- Mitigating drill string hfto12 Mar 2026US 2026/0071537 A1Schlumberger Technology Corporation
- High temperature superconducting cable based power delivery system in pulsed power drilling1 Jan 2026US 2026/0002416 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Drilling systems with sensors for determining properties of drilling fluid downhole402US 6,176,323 B1Baker Hughes Incorporated · 2001
- Drilling system with an acoustic measurement-while-driving system for determining parameters of interest and controlling the drilling direction353US 6,088,294 ABaker Hughes Incorporated · 2000
- Actively controlled rotary steerable system and method for drilling wells344US 6,092,610 ASchlumberger Technology Corporation · 2000
- Closed loop drilling system295US 5,842,149 ABaker Hughes Incorporated · 1998
- Drilling system utilizing downhole dysfunctions for determining corrective actions and simulating drilling conditions291US 6,021,377 ABaker Hughes Incorporated · 2000