G01V 3/26
Operating with magnetic or electric fields produced or modified either by the
Official title: operating with magnetic or electric fields produced or modified either by the surrounding earth formation or by the detecting device (with electromagnetic waves G01V3/30)
G01V3/26 (Operating with magnetic or electric fields produced or modified either by the) appears on 1,560 US grants and 1,491 published applications in this corpus.
Search patents in G01V- Granted patents
- 1,560
- Published applications
- 1,491
- Assignees
- 257
- Inventors
- 1,650
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 3 | 0 |
| 1978 | 6 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 6 | 0 |
| 1982 | 7 | 0 |
| 1983 | 3 | 0 |
| 1984 | 16 | 0 |
| 1985 | 10 | 0 |
| 1986 | 7 | 0 |
| 1987 | 10 | 0 |
| 1988 | 12 | 0 |
| 1989 | 10 | 0 |
| 1990 | 8 | 0 |
| 1991 | 9 | 0 |
| 1992 | 12 | 0 |
| 1993 | 9 | 0 |
| 1994 | 7 | 0 |
| 1995 | 15 | 0 |
| 1996 | 13 | 0 |
| 1997 | 16 | 0 |
| 1998 | 13 | 0 |
| 1999 | 15 | 0 |
| 2000 | 16 | 0 |
| 2001 | 10 | 3 |
| 2002 | 22 | 17 |
| 2003 | 40 | 51 |
| 2004 | 24 | 40 |
| 2005 | 28 | 46 |
| 2006 | 40 | 35 |
| 2007 | 31 | 41 |
| 2008 | 31 | 41 |
| 2009 | 29 | 50 |
| 2010 | 31 | 55 |
| 2011 | 44 | 51 |
| 2012 | 36 | 43 |
| 2013 | 30 | 43 |
| 2014 | 45 | 66 |
| 2015 | 35 | 104 |
| 2016 | 60 | 143 |
| 2017 | 102 | 120 |
| 2018 | 106 | 142 |
| 2019 | 154 | 99 |
| 2020 | 104 | 69 |
| 2021 | 109 | 73 |
| 2022 | 70 | 32 |
| 2023 | 52 | 51 |
| 2024 | 41 | 25 |
| 2025 | 35 | 26 |
| 2026 | 25 | 25 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Integrity evaluation of nested tubulars of a well system using azimuthal and non-azimuthal information6 Oct 2026US 12,754,341 B2Halliburton Energy Services.Inc.
- Neighboring resistivity anisotropy determination15 Sep 2026US 12,736,704 B2Halliburton Energy Services.Inc.
- Three-dimensional inversion of multi-component electromagnetic measurements using a fast proxy model25 Aug 2026US 12,716,347 B2Halliburton Energy Services.Inc.
- Low inclination magnetometer bias compensation for dynamic surveying14 Jul 2026US 12,680,445 B1Schlumberger Technology Corporation
- Coal spontaneous combustion downhole detection system and method based on self-potential method14 Jul 2026US 12,681,203 B2Shandong University of Science and Technology
- Well integrity evaluation with eddy current diffusion time response1 Oct 2026US 2026/0299159 A1Schlumberger Technology Corporation
- Ground detection technology for pipe damage based on alternating electromagnetic excitation10 Sep 2026US 2026/0267027 A1Southwest Petroleum University
- System and method for calibrating through-casing electromagnetic instruments6 Aug 2026US 2026/0227545 A1China Petroleum & Chemical Corporation
- Downhole anisotropy inversion for look ahead detection during drilling30 Jul 2026US 2026/0219414 A1Halliburton Energy Services.Inc.
- Multiple pipes deformation detection using electromagnetic techniques23 Jul 2026US 2026/0211147 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Downhole combination tool358US 5,064,006 AMagrange, Inc · 1991
- Systems and methods for electromagnetic waterfront surveillance in a vicinity of an oil well347US 11,035,972 B2Saudi Arabian Oil Company · 2021
- Method for drilling a borehole from one cased borehole to another cased borehole312US 5,541,517 AShell Oil Company · 1996
- In-situ method for determining pore size distribution, capillary pressure and permeability296US 4,644,283 AShell Oil Company · 1987
- Rotating magnet for distance and direction measurements from a first borehole to a second borehole292US 5,589,775 AVector Magnetics, Inc. · 1996