C09K 8/487
Fluid loss control additives
Official title: Fluid loss control additives; Additives for reducing or preventing circulation loss
C09K8/487 (Fluid loss control additives) appears on 506 US grants and 487 published applications in this corpus.
Search patents in C09K- Granted patents
- 506
- Published applications
- 487
- Assignees
- 123
- Inventors
- 778
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 1 | 0 |
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 7 | 0 |
| 1985 | 6 | 0 |
| 1986 | 8 | 0 |
| 1987 | 7 | 0 |
| 1988 | 4 | 0 |
| 1989 | 3 | 0 |
| 1990 | 4 | 0 |
| 1991 | 5 | 0 |
| 1992 | 8 | 0 |
| 1993 | 8 | 0 |
| 1994 | 7 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 3 | 0 |
| 2001 | 3 | 2 |
| 2002 | 1 | 0 |
| 2003 | 1 | 4 |
| 2004 | 6 | 10 |
| 2005 | 3 | 11 |
| 2006 | 11 | 12 |
| 2007 | 8 | 12 |
| 2008 | 8 | 14 |
| 2009 | 9 | 10 |
| 2010 | 12 | 18 |
| 2011 | 7 | 21 |
| 2012 | 8 | 23 |
| 2013 | 17 | 17 |
| 2014 | 21 | 19 |
| 2015 | 10 | 29 |
| 2016 | 18 | 24 |
| 2017 | 23 | 22 |
| 2018 | 26 | 53 |
| 2019 | 51 | 57 |
| 2020 | 44 | 34 |
| 2021 | 42 | 21 |
| 2022 | 24 | 14 |
| 2023 | 26 | 17 |
| 2024 | 12 | 14 |
| 2025 | 20 | 18 |
| 2026 | 8 | 11 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Core-shell particles for subterranean operations15 Sep 2026US 12,735,623 B2Halliburton Energy Services.Inc.
- Biodegradable and acid soluble materials for control of loss of circulation in reservoir drilling operations8 Sep 2026US 12,729,336 B2
- Method for subsurface injection conformance improvement using micro calcium carbonate particles11 Aug 2026US 12,703,820 B2Millcreek Capital Management LLC
- Modified graphite-coated soft particle and method for preparing same, and profile control and water shutoff agent and application thereof21 Jul 2026US 12,686,807 B2China University of Petroleum (East China)
- Repairing wellbore cement structures and related compositions12 May 2026US 12,624,273 B2Saudi Arabian Oil Company
- High temperature universal fluids and methods and systems related thereto1 Oct 2026US 2026/0297415 A1Aramco Services Company
- Synergistic approach to develop resilient cement systems for long term wellbore integrity of oil, gas and geothermal wells17 Sep 2026US 2026/0275183 A1Saudi Arabian Oil Company
- Fluid loss control for geopolymer system30 Jul 2026US 2026/0218035 A1Schlumberger Technology Corporation
- Temperature-resistant thixotropic agent, and preparation method and use thereof23 Jul 2026US 2026/0209592 A1China University of Petroleum (East China)
- Methods of servicing a wellbore using a volcanic ash sealant composition9 Jul 2026US 2026/0193516 A1Saudi Arabian Oil Company
Most cited
By later US patents
- Hydrolytically stable polymers for use in oil field cementing methods and compositions237US 4,555,269 AHalliburton Company · 1985
- Method of reducing fluid loss in cement compositions which may contain substantial salt concentrations203US 4,676,317 AHalliburton Company · 1987
- Hydrolytically stable polymers for use in oil field cementing methods and compositions195US 4,515,635 AHalliburton Company · 1985
- Dispersant and fluid loss additives for oil field cements139US 4,557,763 AHalliburton Company · 1985
- Cement compositions for cementing wells, allowing pressure gas-channeling in the cemented annulus to be controlled111US 4,537,918 AEtudes et Fabrication Dowell Schlumberger · 1985