E21B 47/092
By detecting magnetic anomalies
Official title: by detecting magnetic anomalies
E21B47/092 (By detecting magnetic anomalies) appears on 510 US grants and 545 published applications in this corpus.
Search patents in E21B- Granted patents
- 510
- Published applications
- 545
- Assignees
- 170
- Inventors
- 923
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 4 | 0 |
| 1981 | 2 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 5 | 0 |
| 1987 | 4 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 5 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 4 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 4 | 0 |
| 1999 | 2 | 0 |
| 2000 | 4 | 0 |
| 2001 | 5 | 0 |
| 2002 | 3 | 6 |
| 2003 | 3 | 10 |
| 2004 | 9 | 7 |
| 2005 | 3 | 3 |
| 2006 | 5 | 8 |
| 2007 | 6 | 3 |
| 2008 | 8 | 11 |
| 2009 | 5 | 8 |
| 2010 | 10 | 9 |
| 2011 | 8 | 10 |
| 2012 | 6 | 9 |
| 2013 | 3 | 18 |
| 2014 | 11 | 26 |
| 2015 | 21 | 38 |
| 2016 | 15 | 53 |
| 2017 | 35 | 47 |
| 2018 | 31 | 50 |
| 2019 | 50 | 42 |
| 2020 | 54 | 42 |
| 2021 | 46 | 39 |
| 2022 | 39 | 24 |
| 2023 | 30 | 26 |
| 2024 | 22 | 18 |
| 2025 | 18 | 16 |
| 2026 | 9 | 22 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Devices, systems, and methods for identifying a radial position of an expandable tool29 Sep 2026US 12,747,663 B1Schlumberger Technology Corporation
- Localizing a tool in a tubular conduit1 Sep 2026US 12,723,506 B2Saudi Arabian Oil Company
- Actuation device for actuating a target sleeve valve assembly, and related systems and methods18 Aug 2026US 12,709,961 B2ExxonMobil Technology and Engineering Company
- Three-dimensional unwrapping processing method and system for borehole transient electromagnetic method23 Jun 2026US 12,663,557 B2Anhui Huizhou Geology Security Institute Co., Ltd
- Electrically conductive proppant and methods for detecting, locating and characterizing the electrically conductive proppant2 Jun 2026US 12,644,042 B2Carbo Ceramics Inc.
- Electrically conductive proppant and methods for detecting, locating and characterizing the electrically conductive proppant24 Sep 2026US 2026/0286214 A1Carbo Ceramics Inc.
- Intelligent traction systems and control methods thereof10 Sep 2026US 2026/0266170 A1Chengdu University of Technology
- Drillstring control framework27 Aug 2026US 2026/0251049 A1Schlumberger Technology Corporation
- Droppable object with locating system and pressure pulse telemetry actuator for use in a wellbore6 Aug 2026US 2026/0226823 A1Schlumberger Technology Corporation
- Horizontal Directional Drilling Guidence System23 Jul 2026US 2026/0210187 A1
Most cited
By later US patents
- Downhole combination tool358US 5,064,006 AMagrange, Inc · 1991
- Three magnet casing collar locator243US 4,808,925 AHalliburton Company · 1989
- Method and apparatus for determining position in a pipe176US 6,759,968 B2Marathon Oil Company · 2004
- Composite coiled tubing apparatus and methods167US 5,828,003 ADowell, a division of Schlumberger Technology Corporation · 1998
- Method and apparatus for determining position in a pipe167US 6,333,699 B1Marathon Oil Company · 2001