E21B 43/02
Subsoil filtering
E21B43/02 (Subsoil filtering) appears on 4,838 US grants and 4,395 published applications in this corpus.
Search patents in E21B- Granted patents
- 4,838
- Published applications
- 4,395
- Assignees
- 808
- Inventors
- 5,539
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 38 | 0 |
| 1977 | 27 | 0 |
| 1978 | 26 | 0 |
| 1979 | 14 | 0 |
| 1980 | 17 | 0 |
| 1981 | 32 | 0 |
| 1982 | 28 | 0 |
| 1983 | 38 | 0 |
| 1984 | 35 | 0 |
| 1985 | 42 | 0 |
| 1986 | 32 | 0 |
| 1987 | 43 | 0 |
| 1988 | 27 | 0 |
| 1989 | 45 | 0 |
| 1990 | 41 | 0 |
| 1991 | 43 | 0 |
| 1992 | 54 | 0 |
| 1993 | 54 | 0 |
| 1994 | 70 | 0 |
| 1995 | 51 | 0 |
| 1996 | 43 | 0 |
| 1997 | 35 | 0 |
| 1998 | 59 | 0 |
| 1999 | 64 | 0 |
| 2000 | 65 | 0 |
| 2001 | 74 | 27 |
| 2002 | 88 | 137 |
| 2003 | 116 | 172 |
| 2004 | 150 | 247 |
| 2005 | 90 | 220 |
| 2006 | 186 | 149 |
| 2007 | 153 | 176 |
| 2008 | 140 | 151 |
| 2009 | 108 | 168 |
| 2010 | 150 | 180 |
| 2011 | 121 | 153 |
| 2012 | 130 | 166 |
| 2013 | 109 | 195 |
| 2014 | 128 | 202 |
| 2015 | 174 | 236 |
| 2016 | 178 | 243 |
| 2017 | 211 | 239 |
| 2018 | 202 | 240 |
| 2019 | 250 | 200 |
| 2020 | 230 | 173 |
| 2021 | 177 | 186 |
| 2022 | 197 | 141 |
| 2023 | 138 | 123 |
| 2024 | 124 | 122 |
| 2025 | 119 | 82 |
| 2026 | 72 | 67 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Systems and methods of deploying a wiper plug in a downhole tubular string6 Oct 2026US 12,753,670 B1Halliburton Energy Services.Inc.
- Systems and methods for attached-anchored casing stub repair6 Oct 2026US 12,753,678 B2Saudi Arabian Oil Company
- Method of creating an annular zonal isolation seal in a downhole annulus6 Oct 2026US 12,753,679 B2Shell USA, Inc.
- System for restoring the mechanical integrity of small-diameter casing or production tubing in hydrocarbon reservoir wells6 Oct 2026US 12,753,680 B2Instituto Mexicano Del Petroleo
- Downhole filter29 Sep 2026US 12,746,488 B2Baker Hughes Oilfield Operations LLC
- Bi-directional Running Tool for Expandable Liner Hanger8 Oct 2026US 2026/0309007 A1Halliburton Energy Services.Inc.
- Downhole tool, well system, and method for ammonia or methanol production1 Oct 2026US 2026/0298051 A1Halliburton Energy Services.Inc.
- Liner hanger setting tool including a split ring cone, a well system and a method1 Oct 2026US 2026/0298052 A1Halliburton Energy Services.Inc.
- Liner hanger setting tool including first and second cone assembly portions, a well system and a method1 Oct 2026US 2026/0298053 A1Halliburton Energy Services.Inc.
- Liner hanger setting tool including a spiral split ring cone, a well system and a method1 Oct 2026US 2026/0298054 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Method of completing an uncased section of a borehole576US 5,366,012 AShell Oil Company · 1994
- Expandable tubing for a well bore hole and method of expanding443US 6,354,373 B1Schlumberger Technology Corporation · 2002
- Method and apparatus for testing, completion and/or maintaining wellbores using a sensor device420US 5,829,520 ABaker Hughes Incorporated · 1998
- Method of creating a wellbore in an underground formation356US 5,348,095 AShell Oil Company · 1994
- Control of particulate flowback in subterranean wells341US 5,833,000 AHalliburton Energy Services.Inc. · 1998