E21B 43/261
Separate steps of cementing, plugging or consolidating and fracturing or attacking the
Official title: {Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation}
E21B43/261 (Separate steps of cementing, plugging or consolidating and fracturing or attacking the) appears on 408 US grants and 361 published applications in this corpus.
Search patents in E21B- Granted patents
- 408
- Published applications
- 361
- Assignees
- 152
- Inventors
- 772
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 4 | 0 |
| 1978 | 8 | 0 |
| 1979 | 4 | 0 |
| 1980 | 4 | 0 |
| 1981 | 8 | 0 |
| 1982 | 3 | 0 |
| 1983 | 4 | 0 |
| 1984 | 7 | 0 |
| 1985 | 4 | 0 |
| 1986 | 2 | 0 |
| 1987 | 3 | 0 |
| 1988 | 5 | 0 |
| 1989 | 7 | 0 |
| 1990 | 4 | 0 |
| 1991 | 7 | 0 |
| 1992 | 6 | 0 |
| 1993 | 11 | 0 |
| 1994 | 9 | 0 |
| 1995 | 3 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 5 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 2 |
| 2003 | 1 | 0 |
| 2004 | 2 | 3 |
| 2005 | 0 | 4 |
| 2006 | 3 | 6 |
| 2007 | 4 | 13 |
| 2008 | 3 | 12 |
| 2009 | 10 | 8 |
| 2010 | 6 | 5 |
| 2011 | 4 | 11 |
| 2012 | 9 | 7 |
| 2013 | 7 | 16 |
| 2014 | 11 | 27 |
| 2015 | 12 | 20 |
| 2016 | 17 | 22 |
| 2017 | 16 | 22 |
| 2018 | 17 | 23 |
| 2019 | 17 | 18 |
| 2020 | 26 | 26 |
| 2021 | 23 | 30 |
| 2022 | 30 | 25 |
| 2023 | 26 | 19 |
| 2024 | 24 | 12 |
| 2025 | 12 | 20 |
| 2026 | 11 | 10 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Cement system for CO2 injection and sequestration in mafic/ultramafic rock and method of use8 Sep 2026US 12,729,607 B2Protostar Group Ltd.
- Composition and methods for inhibiting corrosion of metal during acidizing a wellbore in a subterranean formation for fracking28 Jul 2026US 12,692,428 B2
- Cooling for geothermal well drilling14 Jul 2026US 12,680,391 B2Eavor Technologies Inc.
- Methods and systems for fracing7 Jul 2026US 12,674,379 B2Hangzhou Guangli Technology Co., Ltd.
- Hydraulic integrity analysis2 Jun 2026US 12,644,382 B2ConocoPhillips Company
- Fixed-Volume Setting Tool24 Sep 2026US 2026/0286798 A1DBK Industries, LLC
- Composition and methods for inhibiting corrosion of metal during acidizing a wellbore in a subterranean formation for fracking9 Jul 2026US 2026/0193524 A1
- Chemical compositions for geothermal well stimulation2 Jul 2026US 2026/0184983 A1Schlumberger Technology Corporation
- Detonator assemblies for perforating gun systems2 Jul 2026US 2026/0185426 A1G&H Diversified Manufacturing LP
- Plugging device deployment in subterranean wells21 May 2026US 2026/0139564 A1
Most cited
By later US patents
- Method for treating multiple wellbore intervals339US 6,543,538 B2ExxonMobil Upstream Research Company · 2003
- Oil recovery method and apparatus312US 4,305,463 AOil Trieval Corporation · 1981
- Method and apparatus for isolating and treating subsurface stratas240US 4,125,159 A1978
- Dual-pump formation fracturing222US 9,556,721 B2Schlumberger Technology Corporation · 2017
- Formation fracturing process217US 4,848,467 AConoco Inc. · 1989