E21B 47/02
Determining slope or direction
E21B47/02 (Determining slope or direction) appears on 2,632 US grants and 2,393 published applications in this corpus.
Search patents in E21B- Granted patents
- 2,632
- Published applications
- 2,393
- Assignees
- 628
- Inventors
- 3,712
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 19 | 0 |
| 1977 | 20 | 0 |
| 1978 | 12 | 0 |
| 1979 | 12 | 0 |
| 1980 | 18 | 0 |
| 1981 | 20 | 0 |
| 1982 | 16 | 0 |
| 1983 | 23 | 0 |
| 1984 | 31 | 0 |
| 1985 | 17 | 0 |
| 1986 | 20 | 0 |
| 1987 | 26 | 0 |
| 1988 | 20 | 0 |
| 1989 | 34 | 0 |
| 1990 | 35 | 0 |
| 1991 | 20 | 0 |
| 1992 | 27 | 0 |
| 1993 | 24 | 0 |
| 1994 | 22 | 0 |
| 1995 | 23 | 0 |
| 1996 | 22 | 0 |
| 1997 | 14 | 0 |
| 1998 | 21 | 0 |
| 1999 | 25 | 0 |
| 2000 | 23 | 0 |
| 2001 | 26 | 8 |
| 2002 | 37 | 41 |
| 2003 | 41 | 51 |
| 2004 | 31 | 51 |
| 2005 | 47 | 48 |
| 2006 | 48 | 40 |
| 2007 | 35 | 44 |
| 2008 | 30 | 56 |
| 2009 | 33 | 77 |
| 2010 | 63 | 68 |
| 2011 | 43 | 62 |
| 2012 | 45 | 64 |
| 2013 | 54 | 79 |
| 2014 | 55 | 97 |
| 2015 | 73 | 124 |
| 2016 | 89 | 203 |
| 2017 | 113 | 174 |
| 2018 | 126 | 162 |
| 2019 | 202 | 139 |
| 2020 | 178 | 149 |
| 2021 | 160 | 151 |
| 2022 | 128 | 109 |
| 2023 | 126 | 91 |
| 2024 | 113 | 119 |
| 2025 | 109 | 104 |
| 2026 | 83 | 82 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Logging tool inversion integration29 Sep 2026US 12,747,661 B2Schlumberger Technology Corporation
- Interference compensated cross-axial magnetometer measurements22 Sep 2026US 12,742,380 B2Schlumberger Technology Corporation
- Method and system for controlling a multi-stage wireline operation in a well15 Sep 2026US 12,735,948 B2
- Systems and methods for estimating depth of wellbore survey measurements15 Sep 2026US 12,735,980 B1Schlumberger Technology Corporation
- Methods and systems for predicting conditions ahead of a drill bit8 Sep 2026US 12,729,618 B2Saudi Arabian Oil Company
- Fretting-wear resistant beacon lid1 Oct 2026US 2026/0298076 A1The Charles Machine Works, Inc.
- Systems and methods for multi-finger caliper tool1 Oct 2026US 2026/0298079 A1Schlumberger Technology Corporation
- Automated control of trajectory of downhole drilling24 Sep 2026US 2026/0286829 A1Schlumberger Technology Corporation
- System and method for preventing collisions in wellbores10 Sep 2026US 2026/0266175 A1Schlumberger Technology Corporation
- Milling assembly for drilling a multilateral wellbore10 Sep 2026US 2026/0266176 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Method and apparatus employing received independent magnetic field components of a transmitted alternating magnetic field for determining location494US 4,710,708 ADevelco, Inc. · 1987
- Downhole combination tool358US 5,064,006 AMagrange, Inc · 1991
- Method for drilling a borehole from one cased borehole to another cased borehole312US 5,541,517 AShell Oil Company · 1996
- Rotating magnet for distance and direction measurements from a first borehole to a second borehole292US 5,589,775 AVector Magnetics, Inc. · 1996
- Drilling system with downhole apparatus for determining parameters of interest and for adjusting drilling direction in response thereto284US 5,812,068 ABaker Hughes Incorporated · 1998