E21B 7/061
The tool shaft advancing relative to a guide
Official title: {the tool shaft advancing relative to a guide, e.g. a curved tube or a whipstock}
E21B7/061 (The tool shaft advancing relative to a guide) appears on 848 US grants and 606 published applications in this corpus.
Search patents in E21B- Granted patents
- 848
- Published applications
- 606
- Assignees
- 195
- Inventors
- 1,089
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 7 | 0 |
| 1982 | 2 | 0 |
| 1983 | 7 | 0 |
| 1984 | 4 | 0 |
| 1985 | 4 | 0 |
| 1986 | 3 | 0 |
| 1987 | 7 | 0 |
| 1988 | 8 | 0 |
| 1989 | 6 | 0 |
| 1990 | 4 | 0 |
| 1991 | 5 | 0 |
| 1992 | 8 | 0 |
| 1993 | 6 | 0 |
| 1994 | 17 | 0 |
| 1995 | 37 | 0 |
| 1996 | 25 | 0 |
| 1997 | 20 | 0 |
| 1998 | 37 | 0 |
| 1999 | 31 | 0 |
| 2000 | 35 | 0 |
| 2001 | 37 | 6 |
| 2002 | 32 | 41 |
| 2003 | 21 | 17 |
| 2004 | 17 | 16 |
| 2005 | 19 | 13 |
| 2006 | 14 | 14 |
| 2007 | 13 | 12 |
| 2008 | 7 | 12 |
| 2009 | 7 | 14 |
| 2010 | 7 | 15 |
| 2011 | 10 | 16 |
| 2012 | 16 | 20 |
| 2013 | 12 | 20 |
| 2014 | 18 | 23 |
| 2015 | 21 | 30 |
| 2016 | 28 | 35 |
| 2017 | 18 | 15 |
| 2018 | 17 | 36 |
| 2019 | 29 | 25 |
| 2020 | 35 | 31 |
| 2021 | 33 | 27 |
| 2022 | 26 | 27 |
| 2023 | 27 | 30 |
| 2024 | 25 | 51 |
| 2025 | 45 | 40 |
| 2026 | 32 | 20 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Two pass window milling system that can be deployed and operated in one trip6 Oct 2026US 12,753,668 B2Halliburton Energy Services.Inc.
- Slidable isolation sleeve with I-shaped seal6 Oct 2026US 12,753,675 B2Halliburton Energy Services.Inc.
- Latch coupling including unique axial alignment slots15 Sep 2026US 12,735,952 B2Halliburton Energy Services.Inc.
- Device and use thereof within an interval control valve8 Sep 2026US 12,729,605 B1Saudi Arabian Oil Company
- System and method for anchoring and stroking a downhole motor milling assembly in a floating rig environment1 Sep 2026US 12,723,481 B2Halliburton Energy Services.Inc.
- Drilling a multilateral closed-loop geothermal well24 Sep 2026US 2026/0286781 A1Eavor Technologies Inc.
- Milling assembly for drilling a multilateral wellbore10 Sep 2026US 2026/0266176 A1Halliburton Energy Services.Inc.
- Devices, systems, and methods for wellbore operations20 Aug 2026US 2026/0243132 A1Halliburton Energy Services.Inc.
- Two pass window milling system that can be deployed and operated in one trip13 Aug 2026US 2026/0235008 A1Halliburton Energy Services.Inc.
- Wellbore controllable chamber-forming granular-flow mining system6 Aug 2026US 2026/0226817 A1Blueland Technology Limited
Most cited
By later US patents
- Method and apparatus for conversion of coal in situ366US 4,776,638 AUniversity of Kentucky Research Foundation · 1988
- Method and apparatus for sealing the juncture between a vertical well and one or more horizontal wells using deformable sealing means361US 5,388,648 ABaker Hughes Incorporated · 1995
- Expandable wellbore junction301US 6,135,208 AHalliburton Energy Services.Inc. · 2000
- Downhole equipment, tools and assembly procedures for the drilling, tie-in and completion of vertical cased oil wells connected to liner-equipped multiple drainholes290US 5,462,120 AS-Cal Research Corp. · 1995
- Dynamic orienting reference system for directional drilling248US 6,192,748 B1Computalog Limited · 2001