E21B 43/1195
Replacement of drilling mud
Official title: {Replacement of drilling mud; decrease of undesirable shock waves}
E21B43/1195 (Replacement of drilling mud) appears on 115 US grants and 92 published applications in this corpus.
Search patents in E21B- Granted patents
- 115
- Published applications
- 92
- Assignees
- 29
- Inventors
- 176
- Latest grant
- 3 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 3 | 0 |
| 1985 | 5 | 0 |
| 1986 | 4 | 0 |
| 1987 | 4 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 2 | 1 |
| 2003 | 3 | 2 |
| 2004 | 1 | 5 |
| 2005 | 3 | 3 |
| 2006 | 1 | 1 |
| 2007 | 5 | 5 |
| 2008 | 3 | 2 |
| 2009 | 2 | 5 |
| 2010 | 3 | 7 |
| 2011 | 6 | 8 |
| 2012 | 5 | 6 |
| 2013 | 10 | 8 |
| 2014 | 6 | 9 |
| 2015 | 4 | 6 |
| 2016 | 6 | 2 |
| 2017 | 2 | 2 |
| 2018 | 4 | 2 |
| 2019 | 1 | 2 |
| 2020 | 1 | 5 |
| 2021 | 8 | 4 |
| 2022 | 3 | 1 |
| 2023 | 3 | 1 |
| 2024 | 0 | 1 |
| 2025 | 2 | 3 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Hoop stress reducer in perforating guns3 Feb 2026US 12,540,532 B2Halliburton Energy Services.Inc.
- Perforating gun assembly with reduced shock transmission9 Dec 2025US 12,492,617 B2Halliburton Energy Services.Inc.
- Active energy-absorbing shock absorber for perforation combined well testing16 Sep 2025US 12,416,224 B2Southwest Petroleum University
- Perforating gun for oil and gas wells, and system and method for using the same26 Sep 2023US 11,767,739 B2Expro Americas, LLC
- Solid-state damping of mechanical vibration in tool string19 Sep 2023US 11,761,324 B2Halliburton Energy Services.Inc.
- Systems and methods for using explosive expansion downhole tools to reduce amount of undesirable fluids in hydrocarbons produced via a wellbore14 May 2026US 2026/0132693 A1
- Vibration-damping sub including a plurality of angled shaped holes19 Jun 2025US 2025/0198241 A1Halliburton Energy Services.Inc.
- Downhole system for conveying an explosive tool within a wellbore and reducing damage to other tools of the downhole system12 Jun 2025US 2025/0188810 A1
- Hoop Stress Reducer In Perforating Guns27 Mar 2025US 2025/0101839 A1Halliburton Energy Services.Inc.
- Active energy-absorbing shock absorber for perforation combined well testing3 Oct 2024US 2024/0328288 A1Southwest Petroleum University
Most cited
By later US patents
- Apparatus for absorbing shock159US 4,817,710 AHalliburton Company · 1989
- Reservoir communication with a wellbore97US 6,598,682 B2Schlumberger Technology Corporation · 2003
- Shock and vibration protection for tools containing explosive components87US 6,412,415 B1Schlumberger Technology Corporation · 2002
- Shock absorber for use in a wellbore including a frangible breakup element preventing shock absorption before shattering allowing shock absorption after shattering70US 5,366,013 ASchlumberger Technology Corporation · 1994
- Controlling transient underbalance in a wellbore65US 6,732,798 B2Schlumberger Technology Corporation · 2004