E21B 21/003
Means for stopping loss of drilling fluid
Official title: {Means for stopping loss of drilling fluid (plastering the borehole wall E21B33/138)}
E21B21/003 (Means for stopping loss of drilling fluid) appears on 874 US grants and 883 published applications in this corpus.
Search patents in E21B- Granted patents
- 874
- Published applications
- 883
- Assignees
- 223
- Inventors
- 1,331
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 1 | 0 |
| 1978 | 3 | 0 |
| 1979 | 5 | 0 |
| 1980 | 2 | 0 |
| 1981 | 5 | 0 |
| 1982 | 0 | 0 |
| 1983 | 5 | 0 |
| 1984 | 5 | 0 |
| 1985 | 10 | 0 |
| 1986 | 7 | 0 |
| 1987 | 9 | 0 |
| 1988 | 5 | 0 |
| 1989 | 7 | 0 |
| 1990 | 8 | 0 |
| 1991 | 5 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 4 | 0 |
| 1995 | 1 | 0 |
| 1996 | 4 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 0 |
| 2002 | 1 | 3 |
| 2003 | 1 | 5 |
| 2004 | 5 | 4 |
| 2005 | 3 | 5 |
| 2006 | 3 | 6 |
| 2007 | 4 | 3 |
| 2008 | 3 | 7 |
| 2009 | 2 | 8 |
| 2010 | 6 | 13 |
| 2011 | 2 | 13 |
| 2012 | 9 | 12 |
| 2013 | 8 | 32 |
| 2014 | 10 | 23 |
| 2015 | 16 | 41 |
| 2016 | 20 | 67 |
| 2017 | 37 | 86 |
| 2018 | 73 | 108 |
| 2019 | 110 | 113 |
| 2020 | 95 | 77 |
| 2021 | 118 | 74 |
| 2022 | 80 | 50 |
| 2023 | 70 | 41 |
| 2024 | 41 | 30 |
| 2025 | 34 | 38 |
| 2026 | 26 | 24 |
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.
- Sealant compositions comprising red mud, subterranean operation fluids thereof, and related methods15 Sep 2026US 12,735,624 B1Saudi Arabian Oil Company
- System for maintaining reversible dynamic range control information associated with parametric audio coders15 Sep 2026US 12,738,288 B2Dolby International AB
- Thixotropic slurry with enhanced reliability for use in a wellbore8 Sep 2026US 12,729,335 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
- Apparatus utilizing shape-memory and self-assembly to plug relatively wide remote fractures8 Oct 2026US 2026/0308440 A1The Penn State Research Foundation
- Plugging assemblies for plugging cased wellbores1 Oct 2026US 2026/0298044 A1G&H Diversified Manufacturing LP
- Freshwater based drilling fluids using a crosslinked starch24 Sep 2026US 2026/0286210 A1Baker Hughes Oilfield Operations LLC
- Lost Circulation Material Comprising Reclaimed Fiberglass Wind Turbine Blades24 Sep 2026US 2026/0286794 A1Everpoint Services Inc.
- Expandable wellbore loss control patch20 Aug 2026US 2026/0243137 A1Saudi Arabian Oil Company
Most cited
By later US patents
- Method of deep drilling249US 4,483,399 A1984
- Downhole valve for oil/gas well187US 5,499,687 A1996
- Lost circulation drilling fluid166US 4,498,995 A1985
- Prevention of lost circulation of drilling muds149US 4,460,052 A1984
- Method and apparatus for moulding protective tubing simultaneously with bore hole drilling143US 3,935,910 ACompagnie Francaise des Petroles · 1976