C09K 8/38
Gaseous or foamed well-drilling compositions
C09K8/38 (Gaseous or foamed well-drilling compositions) appears on 161 US grants and 150 published applications in this corpus.
Search patents in C09K- Granted patents
- 161
- Published applications
- 150
- Assignees
- 94
- Inventors
- 360
- Latest grant
- 28 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 0 |
| 1978 | 6 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 3 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 3 | 0 |
| 1997 | 4 | 0 |
| 1998 | 4 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 5 | 0 |
| 2002 | 3 | 1 |
| 2003 | 2 | 5 |
| 2004 | 5 | 5 |
| 2005 | 0 | 6 |
| 2006 | 6 | 5 |
| 2007 | 5 | 5 |
| 2008 | 0 | 4 |
| 2009 | 2 | 5 |
| 2010 | 4 | 11 |
| 2011 | 5 | 5 |
| 2012 | 6 | 9 |
| 2013 | 4 | 8 |
| 2014 | 9 | 6 |
| 2015 | 9 | 12 |
| 2016 | 3 | 6 |
| 2017 | 4 | 3 |
| 2018 | 3 | 9 |
| 2019 | 6 | 5 |
| 2020 | 9 | 11 |
| 2021 | 8 | 6 |
| 2022 | 4 | 4 |
| 2023 | 6 | 5 |
| 2024 | 4 | 5 |
| 2025 | 5 | 6 |
| 2026 | 3 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Gemini surfactant as foaming agent for foam drilling28 Apr 2026US 12,612,543 B2King Fahd University of Petroleum and Minerals
- Lignin-based drilling fluids and related methods14 Apr 2026US 12,600,894 B2LignoSol IP Limited
- Surfactants for oil and gas production17 Mar 2026US 12,577,452 B2AdvanSix Resins & Chemicals LLC
- Method of underbalanced drilling using foaming agent30 Dec 2025US 12,509,952 B2King Fahd University of Petroleum and Minerals
- Stabilized CO2 foam compositions for subterranean fracturing applications and compositions related thereto9 Dec 2025US 12,492,332 B2King Fahd University of Petroleum and Minerals
- Chemical methods for cavitation inception in downhole environments25 Jun 2026US 2026/0176520 A1Aramco Innovations LLC
- Stabilized co2 foam compositions for subteranean fracturing applications and compositions related thereto19 Mar 2026US 2026/0078297 A1King Fahd University of Petroleum and Minerals
- Hydrogen sulfide dissociation using reactive sulfur species5 Feb 2026US 2026/0035245 A1Saudi Arabian Oil Company
- Gemini surfactant as foaming agent for foam drilling20 Nov 2025US 2025/0354048 A1King Fahd University of Petroleum and Minerals
- Method of underbalanced drilling using foaming agent20 Nov 2025US 2025/0354444 A1King Fahd University of Petroleum and Minerals
Most cited
By later US patents
- Foamable drilling fluid and methods of use in well drilling operations139US 5,716,910 AHalliburton Company · 1998
- Method of performing well drilling operations with a foamable drilling fluid120US 5,851,960 AHalliburton Company · 1998
- Foaming and silt suspending agent111US 4,113,631 AThe Dow Chemical Company · 1978
- Methods of generating gas in well fluids110US 6,715,553 B2Halliburton Energy Services.Inc. · 2004
- Foaming and silt suspending agent103US 4,108,782 AThe Dow Chemical Company · 1978