E21B 27/02
Dump bailers, i.e. containers for depositing substances
Official title: Dump bailers, i.e. containers for depositing substances, e.g. cement or acids
E21B27/02 (Dump bailers, i.e. containers for depositing substances) appears on 244 US grants and 213 published applications in this corpus.
Search patents in E21B- Granted patents
- 244
- Published applications
- 213
- Assignees
- 107
- Inventors
- 469
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 5 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 5 | 0 |
| 1989 | 3 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 3 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 4 | 0 |
| 1997 | 4 | 0 |
| 1998 | 4 | 0 |
| 1999 | 3 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 0 |
| 2002 | 3 | 1 |
| 2003 | 5 | 4 |
| 2004 | 1 | 2 |
| 2005 | 4 | 4 |
| 2006 | 1 | 3 |
| 2007 | 3 | 2 |
| 2008 | 4 | 5 |
| 2009 | 3 | 9 |
| 2010 | 5 | 6 |
| 2011 | 5 | 14 |
| 2012 | 9 | 11 |
| 2013 | 5 | 6 |
| 2014 | 7 | 14 |
| 2015 | 13 | 11 |
| 2016 | 8 | 10 |
| 2017 | 6 | 12 |
| 2018 | 12 | 5 |
| 2019 | 9 | 16 |
| 2020 | 16 | 11 |
| 2021 | 9 | 19 |
| 2022 | 14 | 13 |
| 2023 | 14 | 14 |
| 2024 | 16 | 7 |
| 2025 | 13 | 8 |
| 2026 | 4 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Payload deployment tools and methods of using same25 Aug 2026US 12,716,324 B2
- Milling and debris collecting with multiphase vacuum pump2 Jun 2026US 12,644,359 B2Schlumberger Technology Corporation
- Method and apparatus for downhole fluid fill-up31 Mar 2026US 12,590,498 B1Oilfield Service Professionals, LLC
- Cement dump bailer with hollow bridge plug20 Jan 2026US 12,529,275 B1Saudi Arabian Oil Company
- System and method for permanent plugging of a petroleum well30 Dec 2025US 12,509,959 B2Altus Intervention (Technologies) AS
- Method and tool for cementing wellbore13 Aug 2026US 2026/0235012 A1Baker Hughes Oilfield Operations LLC
- A chemical reaction heat source composition for use in downhole operations and associated apparatus and methods11 Jun 2026US 2026/0160152 A1BiSN Tec Ltd
- Plugging device deployment in subterranean wells21 May 2026US 2026/0139564 A1
- Plugging device deployment in subterranean wells14 May 2026US 2026/0132706 A1
- Plugging device deployment in subterranean wells19 Feb 2026US 2026/0049532 A1
Most cited
By later US patents
- Method and apparatus for placing buoyant ball sealers132US 4,187,909 AExxon Production Research Company · 1980
- Early evaluation system with pump and method of servicing a well128US 5,799,733 AHalliburton Energy Services.Inc. · 1998
- Method for actuating a tool in a well at a given depth and tool allowing the method to be implemented109US 4,640,354 ASchlumberger Technology Corporation · 1987
- Canister, sealing method and composition for sealing a borehole104US 6,910,537 B2The Regents of the University of California · 2005
- Systems of injecting phenolic resin activator during subsurface fracture stimulation for enhanced oil recovery90US 5,595,245 A1997