E21B 17/14
Casing shoes for the protection of the bottom of the casing
Official title: Casing shoes {for the protection of the bottom of the casing}
E21B17/14 (Casing shoes for the protection of the bottom of the casing) appears on 170 US grants and 165 published applications in this corpus.
Search patents in E21B- Granted patents
- 170
- Published applications
- 165
- Assignees
- 65
- Inventors
- 281
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 3 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 5 | 9 |
| 2003 | 2 | 3 |
| 2004 | 3 | 5 |
| 2005 | 2 | 3 |
| 2006 | 6 | 4 |
| 2007 | 6 | 10 |
| 2008 | 4 | 8 |
| 2009 | 5 | 1 |
| 2010 | 6 | 7 |
| 2011 | 8 | 16 |
| 2012 | 9 | 7 |
| 2013 | 3 | 5 |
| 2014 | 5 | 11 |
| 2015 | 6 | 4 |
| 2016 | 3 | 2 |
| 2017 | 7 | 5 |
| 2018 | 5 | 9 |
| 2019 | 4 | 7 |
| 2020 | 9 | 8 |
| 2021 | 8 | 7 |
| 2022 | 9 | 15 |
| 2023 | 10 | 9 |
| 2024 | 8 | 4 |
| 2025 | 9 | 4 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Alignable guidance device for casing entry milling and cementing operations28 Jul 2026US 12,692,755 B2Scientific Drilling International, Inc.
- Baffle collar with double tapered lock ring14 Apr 2026US 12,601,240 B1Expro North Sea Limited
- Limitless injection shoe14 Oct 2025US 12,442,273 B1Weatherford Technology Holdings, LLC
- Self indexing mule shoe mechanism26 Aug 2025US 12,398,601 B2Schlumberger Technology Corporation
- Off-bottom tubular shoe-track with shearable mechanisms8 Jul 2025US 12,352,130 B1Saudi Arabian Oil Company
- Alignable guidance device for casing entry milling and cementing operations24 Sep 2026US 2026/0286789 A1Scientific Drilling International, Inc.
- Limitless injection shoe19 Feb 2026US 2026/0049533 A1Weatherford Technology Holdings, LLC
- Methods and systems for storing hydrogen in a salt cavern28 Aug 2025US 2025/0270914 A1NeuVentus, LLC
- Induction loop cementing progress detection28 Aug 2025US 2025/0270918 A1Halliburton Energy Services.Inc.
- Alignable guidance device for casing entry milling and cementing operations22 May 2025US 2025/0163764 A1Scientific Drilling International, Inc.
Most cited
By later US patents
- Casing mounted sensors, actuators and generators225US 6,429,784 B1Dresser Industries, Inc. · 2002
- Method and apparatus for installing a cementing float shoe on the bottom of a well casing217US 4,413,682 ABaker Oil Tools, Inc. · 1983
- Casing shoe with cutting means135US 6,062,326 AEnterprise Oil plc · 2000
- Casing drilling shoe133US 6,443,247 B1Weatherford/Lamb, Inc. · 2002
- Casing and liner drilling bits125US 7,395,882 B2Baker Hughes Incorporated · 2008