E21B 41/0035
Apparatus or methods for multilateral well technology
Official title: {Apparatus or methods for multilateral well technology, e.g. for the completion of or workover on wells with one or more lateral branches}
E21B41/0035 (Apparatus or methods for multilateral well technology) appears on 841 US grants and 791 published applications in this corpus.
Search patents in E21B- Granted patents
- 841
- Published applications
- 791
- Assignees
- 136
- Inventors
- 1,074
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1983 | 3 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 10 | 0 |
| 1995 | 13 | 0 |
| 1996 | 11 | 0 |
| 1997 | 7 | 0 |
| 1998 | 12 | 0 |
| 1999 | 22 | 0 |
| 2000 | 37 | 0 |
| 2001 | 39 | 15 |
| 2002 | 30 | 40 |
| 2003 | 25 | 27 |
| 2004 | 27 | 49 |
| 2005 | 28 | 37 |
| 2006 | 32 | 14 |
| 2007 | 23 | 7 |
| 2008 | 12 | 20 |
| 2009 | 8 | 23 |
| 2010 | 10 | 21 |
| 2011 | 18 | 20 |
| 2012 | 18 | 24 |
| 2013 | 17 | 28 |
| 2014 | 24 | 26 |
| 2015 | 24 | 32 |
| 2016 | 28 | 41 |
| 2017 | 25 | 24 |
| 2018 | 26 | 40 |
| 2019 | 40 | 22 |
| 2020 | 39 | 39 |
| 2021 | 31 | 45 |
| 2022 | 37 | 44 |
| 2023 | 33 | 28 |
| 2024 | 39 | 51 |
| 2025 | 49 | 55 |
| 2026 | 36 | 19 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- 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.
- Downhole fluid separator in re-entry multilateral well15 Sep 2026US 12,735,971 B2Halliburton Energy Services.Inc.
- Device and use thereof within an interval control valve8 Sep 2026US 12,729,605 B1Saudi Arabian Oil Company
- Downhole fluid separator in lateral of re-entry multilateral well1 Sep 2026US 12,723,500 B2Halliburton Energy Services.Inc.
- Retrievable, below junction, esp, and other devices24 Sep 2026US 2026/0286811 A1Halliburton Energy Services.Inc.
- Systems for Generating Energy from Geothermal Sources and Methods of Operating and Constructing Same24 Sep 2026US 2026/0287213 A1Roda Energy Corporation
- Two part milling and running tool employing a body lock ring17 Sep 2026US 2026/0275830 A1Halliburton Energy Services.Inc.
- Seismic monitoring of disposal wells20 Aug 2026US 2026/0243149 A1ConocoPhillips Company
- Method for synergistic permeability enhancement and extraction of coal mine gas23 Jul 2026US 2026/0210224 A1Chongqing University
Most cited
By later US patents
- 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
- Method and apparatus for sealing the juncture between a vertical well and one or more horizontal wells using deformable sealing means292US 5,318,122 ABaker Hughes Incorporated · 1994
- 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
- Creating zonal isolation between the interior and exterior of a well system284US 6,070,671 AShell Oil Company · 2000