E21B 43/14
Obtaining from a multiple-zone well
E21B43/14 (Obtaining from a multiple-zone well) appears on 1,359 US grants and 1,369 published applications in this corpus.
Search patents in E21B- Granted patents
- 1,359
- Published applications
- 1,369
- Assignees
- 295
- Inventors
- 2,157
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 5 | 0 |
| 1979 | 6 | 0 |
| 1980 | 4 | 0 |
| 1981 | 6 | 0 |
| 1982 | 6 | 0 |
| 1983 | 9 | 0 |
| 1984 | 5 | 0 |
| 1985 | 5 | 0 |
| 1986 | 4 | 0 |
| 1987 | 4 | 0 |
| 1988 | 0 | 0 |
| 1989 | 3 | 0 |
| 1990 | 5 | 0 |
| 1991 | 2 | 0 |
| 1992 | 9 | 0 |
| 1993 | 5 | 0 |
| 1994 | 13 | 0 |
| 1995 | 13 | 0 |
| 1996 | 7 | 0 |
| 1997 | 8 | 0 |
| 1998 | 16 | 0 |
| 1999 | 25 | 0 |
| 2000 | 14 | 0 |
| 2001 | 26 | 9 |
| 2002 | 21 | 30 |
| 2003 | 23 | 40 |
| 2004 | 24 | 34 |
| 2005 | 20 | 25 |
| 2006 | 32 | 23 |
| 2007 | 26 | 26 |
| 2008 | 26 | 38 |
| 2009 | 15 | 33 |
| 2010 | 24 | 36 |
| 2011 | 23 | 39 |
| 2012 | 35 | 56 |
| 2013 | 33 | 86 |
| 2014 | 53 | 79 |
| 2015 | 56 | 100 |
| 2016 | 72 | 114 |
| 2017 | 94 | 102 |
| 2018 | 92 | 74 |
| 2019 | 89 | 74 |
| 2020 | 77 | 73 |
| 2021 | 61 | 79 |
| 2022 | 82 | 59 |
| 2023 | 55 | 43 |
| 2024 | 54 | 38 |
| 2025 | 42 | 35 |
| 2026 | 25 | 24 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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Most cited
By later US patents
- System for completing multiple well intervals336US 7,387,165 B2Schlumberger Technology Corporation · 2008
- Downhole equipment, tools and assembly procedures for the drilling, tie-in and completion of vertical cased oil wells connected to liner-equipped multiple drainholes290US 5,462,120 AS-Cal Research Corp. · 1995
- Simultaneous recovery of crude from multiple zones in a reservoir284US 4,669,542 AMobil Oil Corporation · 1987
- Petroleum well having downhole sensors, communication and power268US 6,679,332 B2Shell Oil Company · 2004
- In situ thermal processing of a tar sands formation266US 7,066,254 B2Shell Oil Company · 2006