C09K 8/40
Spacer compositions
Official title: Spacer compositions, e.g. compositions used to separate well-drilling from cementing masses
C09K8/40 (Spacer compositions) appears on 345 US grants and 407 published applications in this corpus.
Search patents in C09K- Granted patents
- 345
- Published applications
- 407
- Assignees
- 82
- Inventors
- 570
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 5 |
| 2004 | 0 | 4 |
| 2005 | 2 | 3 |
| 2006 | 3 | 11 |
| 2007 | 8 | 4 |
| 2008 | 5 | 8 |
| 2009 | 5 | 6 |
| 2010 | 6 | 12 |
| 2011 | 3 | 22 |
| 2012 | 4 | 19 |
| 2013 | 17 | 19 |
| 2014 | 18 | 22 |
| 2015 | 15 | 24 |
| 2016 | 18 | 33 |
| 2017 | 21 | 32 |
| 2018 | 26 | 46 |
| 2019 | 35 | 28 |
| 2020 | 38 | 36 |
| 2021 | 41 | 20 |
| 2022 | 21 | 16 |
| 2023 | 11 | 9 |
| 2024 | 18 | 14 |
| 2025 | 5 | 9 |
| 2026 | 8 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Wellbore treatment to remove damage and increase production1 Sep 2026US 12,723,490 B2Aegis Chemical Solutions, LLC
- Downhole methods and compositions used in such2 Jun 2026US 12,644,040 B2Dorf Ketal Chemicals Fze
- Downhole methods and compositions used in such19 May 2026US 12,630,758 B2Dorf Ketal Chemicals Fze
- Downhole methods and compositions used in such21 Apr 2026US 12,606,735 B2Dorf Ketal Chemicals Fze
- Method for forming high efficiency geothermal wellbores24 Feb 2026US 12,560,049 B2Eavor Technologies Inc.
- Settable scavenger spacer fluid for displacing drilling mud6 Aug 2026US 2026/0226337 A1Schlumberger Technology Corporation
- Lost-circulation material made from inorganic, recycled roofing materials7 May 2026US 2026/0125592 A1Halliburton Energy Services.Inc.
- Cementing spacer30 Apr 2026US 2026/0117111 A1Riteks, Inc.
- Wellbore servicing compositions containing a latex additive12 Mar 2026US 2026/0071111 A1Halliburton Energy Services.Inc.
- Method of using graphite or graphene in spacer fluid for displacing non-aqueous drilling fluid5 Mar 2026US 2026/0062601 A1Baker Hughes Oilfield Operations LLC
Most cited
By later US patents
- Cementing oil and gas wells using converted drilling fluid181US 4,883,125 AAtlantic Richfield Company · 1989
- Spacer fluids122US 5,030,366 AAtlantic Richfield Company · 1991
- Oil well spacer fluids114US 4,141,843 AHalliburton Company · 1979
- Spacer composition and method of use99US 4,083,407 AThe Dow Chemical Company · 1978
- Well completion spacer fluids and methods95US 5,789,352 AAtlantic Richfield Company · 1998