E21B 43/27
By use of eroding chemicals
Official title: by use of eroding chemicals, e.g. acids
E21B43/27 (By use of eroding chemicals) appears on 457 US grants and 525 published applications in this corpus.
Search patents in E21B- Granted patents
- 457
- Published applications
- 525
- Assignees
- 134
- Inventors
- 1,003
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 3 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 1 |
| 2002 | 2 | 2 |
| 2003 | 2 | 5 |
| 2004 | 4 | 4 |
| 2005 | 2 | 3 |
| 2006 | 5 | 7 |
| 2007 | 1 | 1 |
| 2008 | 2 | 7 |
| 2009 | 3 | 8 |
| 2010 | 4 | 3 |
| 2011 | 4 | 7 |
| 2012 | 4 | 8 |
| 2013 | 6 | 15 |
| 2014 | 7 | 20 |
| 2015 | 10 | 28 |
| 2016 | 11 | 34 |
| 2017 | 23 | 41 |
| 2018 | 37 | 36 |
| 2019 | 30 | 37 |
| 2020 | 35 | 27 |
| 2021 | 30 | 50 |
| 2022 | 46 | 29 |
| 2023 | 54 | 44 |
| 2024 | 30 | 47 |
| 2025 | 38 | 38 |
| 2026 | 35 | 23 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Composition and method for non-mechanical intervention and remediation of wellbore damage and reservoir fractures22 Sep 2026US 12,742,377 B2Kairos Energy Services Inc.
- Single-phase retarded acid systems using amino acids15 Sep 2026US 12,735,627 B2Schlumberger Technology Corporation
- Method for single-stage treatment of siliceous subterranean formations25 Aug 2026US 12,716,022 B2Schlumberger Technology Corporation
- Extraction and integration of waste heat from enhanced geologic hydrogen production25 Aug 2026US 12,716,339 B2Koloma, Inc.
- Methods for enhancing the permeability of reactive rock reservoirs25 Aug 2026US 12,716,340 B2Saudi Arabian Oil Company
- Composition and methods for inhibiting corrosion of metal during acidizing a wellbore in a subterranean formation for fracking24 Sep 2026US 2026/0286211 A1
- Calcium carbonate coated tracers for assessing acid stimulation operations in a hydrocarbon well24 Sep 2026US 2026/0286838 A1Chevron U.S.A.Inc.
- Method and system for enhancing subsurface permeability via electromagnetic fields and electromagnetically responsive particles27 Aug 2026US 2026/0251044 A1
- Method for single-stage treatment of siliceous subterranean formations13 Aug 2026US 2026/0234465 A1Schlumberger Technology Corporation
- Low viscosity polymer-based retarded acid13 Aug 2026US 2026/0234466 A1Schlumberger Technology Corporation
Most cited
By later US patents
- Method and apparatus for stimulation of multiple formation intervals249US 6,394,184 B2ExxonMobil Upstream Research Company · 2002
- Method and apparatus for wellbore fluid treatment180US 6,907,936 B2Packers Plus Energy Services Inc. · 2005
- Delayed blending of additives in well treatment fluids165US 6,613,720 B1Schlumberger Technology Corporation · 2003
- Blowout preventer protector and method of using same135US 6,364,024 B12002
- Use of distributed temperature sensors during wellbore treatments120US 7,055,604 B2Schlumberger Technology Corporation · 2006