E21B 43/13
Specially adapted to dewatering of wells of gas producing reservoirs
Official title: {specially adapted to dewatering of wells of gas producing reservoirs, e.g. methane producing coal beds}
E21B43/13 (Specially adapted to dewatering of wells of gas producing reservoirs) appears on 307 US grants and 315 published applications in this corpus.
Search patents in E21B- Granted patents
- 307
- Published applications
- 315
- Assignees
- 155
- Inventors
- 559
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 4 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 4 | 0 |
| 1999 | 7 | 0 |
| 2000 | 5 | 0 |
| 2001 | 4 | 2 |
| 2002 | 7 | 12 |
| 2003 | 8 | 9 |
| 2004 | 7 | 12 |
| 2005 | 3 | 12 |
| 2006 | 13 | 9 |
| 2007 | 11 | 16 |
| 2008 | 13 | 18 |
| 2009 | 5 | 25 |
| 2010 | 13 | 16 |
| 2011 | 10 | 12 |
| 2012 | 22 | 20 |
| 2013 | 17 | 16 |
| 2014 | 7 | 8 |
| 2015 | 9 | 20 |
| 2016 | 8 | 10 |
| 2017 | 9 | 14 |
| 2018 | 12 | 15 |
| 2019 | 17 | 6 |
| 2020 | 15 | 23 |
| 2021 | 13 | 11 |
| 2022 | 11 | 10 |
| 2023 | 14 | 6 |
| 2024 | 4 | 3 |
| 2025 | 0 | 4 |
| 2026 | 7 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Method and system for hydraulic friction controlled drilling and completing geopressured wells utilizing concentric drill strings123US 6,457,540 B22002
- Auto-cycling plunger and method for auto-cycling plunger lift112US 6,148,923 A2000
- Method for production of gas from a coal seam using intersecting well bores100US 6,280,000 B12001
- Method for stimulating methane production from coal seams98US 5,249,627 AHalliburton Company · 1993
- Apparatus and method for removing production-inhibiting liquid from a wellbore98US 5,501,279 AAmoco Corporation · 1996