E21B 21/068
Using chemical treatment
Official title: {using chemical treatment}
E21B21/068 (Using chemical treatment) appears on 247 US grants and 257 published applications in this corpus.
Search patents in E21B- Granted patents
- 247
- Published applications
- 257
- Assignees
- 125
- Inventors
- 518
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 4 | 0 |
| 1985 | 2 | 0 |
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 5 | 0 |
| 1993 | 5 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 4 | 0 |
| 1999 | 4 | 0 |
| 2000 | 3 | 0 |
| 2001 | 5 | 2 |
| 2002 | 3 | 6 |
| 2003 | 6 | 4 |
| 2004 | 3 | 8 |
| 2005 | 8 | 10 |
| 2006 | 2 | 7 |
| 2007 | 9 | 11 |
| 2008 | 7 | 10 |
| 2009 | 4 | 4 |
| 2010 | 5 | 10 |
| 2011 | 4 | 8 |
| 2012 | 1 | 6 |
| 2013 | 5 | 9 |
| 2014 | 13 | 13 |
| 2015 | 6 | 13 |
| 2016 | 7 | 12 |
| 2017 | 13 | 14 |
| 2018 | 13 | 12 |
| 2019 | 15 | 20 |
| 2020 | 14 | 15 |
| 2021 | 16 | 10 |
| 2022 | 10 | 13 |
| 2023 | 15 | 14 |
| 2024 | 4 | 14 |
| 2025 | 14 | 8 |
| 2026 | 8 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Contaminant remediation with functionalized (meth)acrylic polymer or copolymer macroparticulates and systems related thereto6 Oct 2026US 12,753,257 B2Countertrace LLC
- System and method for responsively injecting chemistries directly into a downhole slurry8 Sep 2026US 12,729,590 B2Sentinel Solutions LLC
- Systems and methods for wellbore drilling utilizing a thermochemical sulfate reduction (TSR) proxy25 Aug 2026US 12,716,349 B2Saudi Arabian Oil Company
- Method for mitigating barite sag in water-based mud with thermochemical fluid11 Aug 2026US 12,704,032 B2King Fahd University of Petroleum and Minerals
- Drilling fluid optimization for cuttings transport and rate of penetration28 Jul 2026US 12,693,286 B2Schlumberger Technology Corporation
- System and method of tracking drilling fluid data4 Jun 2026US 2026/0154480 A1Baker Hughes Oilfield Operations LLC
- Method of Preparing Drilling Mud Through Integrating Ultrasonic Mixing and Venturi Technology26 Feb 2026US 2026/0055677 A1Baker Hughes Oilfield Operations LLC
- Drilling fluid treatment process and system5 Feb 2026US 2026/0036006 A1Schlumberger Technology Corporation
- Hydrogen sulfide scavenging compositions8 Jan 2026US 2026/0008951 A1Swellfix UK Limited
- Geotechnical characteristics of tailings via lime addition25 Dec 2025US 2025/0388498 A1Graymont Western Canada Inc.
Most cited
By later US patents
- Solvent soaps and methods employing same152US 5,723,423 AUnion Oil Company of California, dba UNOCAL · 1998
- Process for the facilitated waste disposal of working substances based on water-in-oil invert emulsions91US 6,165,946 AHenkel Kommanditgesellschaft auf Aktien · 2000
- Ester based invert emulsion drilling fluids and muds having negative alkalinity86US 5,977,031 AM - I L. L. C. · 1999
- Invert emulsion fluids suitable for drilling82US 5,905,061 A1999
- Method of reducing the concentration of metal soaps of partially esterified phosphates from hydrocarbon flowback fluids79US 6,133,205 ANalco/Exxon Energy Chemical L.P. · 2000