E21B 43/26
By forming crevices or fractures
Official title: by forming crevices or fractures
E21B43/26 (By forming crevices or fractures) appears on 7,515 US grants and 8,478 published applications in this corpus.
Search patents in E21B- Granted patents
- 7,515
- Published applications
- 8,478
- Assignees
- 1,618
- Inventors
- 10,210
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 40 | 0 |
| 1977 | 29 | 0 |
| 1978 | 18 | 0 |
| 1979 | 13 | 0 |
| 1980 | 20 | 0 |
| 1981 | 28 | 0 |
| 1982 | 13 | 0 |
| 1983 | 23 | 0 |
| 1984 | 44 | 0 |
| 1985 | 32 | 0 |
| 1986 | 26 | 0 |
| 1987 | 42 | 0 |
| 1988 | 30 | 0 |
| 1989 | 55 | 0 |
| 1990 | 32 | 0 |
| 1991 | 44 | 0 |
| 1992 | 30 | 0 |
| 1993 | 44 | 0 |
| 1994 | 46 | 0 |
| 1995 | 45 | 0 |
| 1996 | 43 | 0 |
| 1997 | 25 | 0 |
| 1998 | 21 | 0 |
| 1999 | 37 | 0 |
| 2000 | 27 | 0 |
| 2001 | 24 | 7 |
| 2002 | 24 | 26 |
| 2003 | 25 | 48 |
| 2004 | 34 | 49 |
| 2005 | 29 | 63 |
| 2006 | 47 | 81 |
| 2007 | 44 | 92 |
| 2008 | 51 | 112 |
| 2009 | 61 | 119 |
| 2010 | 101 | 131 |
| 2011 | 79 | 164 |
| 2012 | 102 | 199 |
| 2013 | 117 | 325 |
| 2014 | 167 | 425 |
| 2015 | 235 | 435 |
| 2016 | 292 | 632 |
| 2017 | 377 | 645 |
| 2018 | 489 | 645 |
| 2019 | 610 | 614 |
| 2020 | 603 | 611 |
| 2021 | 611 | 665 |
| 2022 | 622 | 583 |
| 2023 | 621 | 557 |
| 2024 | 535 | 506 |
| 2025 | 476 | 436 |
| 2026 | 332 | 308 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- E21B 43/267Reinforcing fractures by propping2,359
- E21B 43/2607Surface equipment specially adapted for fracturing operations2,203
- E21B 43/27By use of eroding chemicals457
- E21B 43/261Separate steps of cementing, plugging or consolidating and fracturing or attacking the408
- E21B 43/2605Using gas or liquefied gas335
- E21B 43/263Using explosives310
Recent patents
- Direct high pressure slurry injection fracturing system and method6 Oct 2026US 12,752,247 B1
- Method of fracturing using a xanthan/guar gum containing fluid6 Oct 2026US 12,753,361 B1Sunita Hydrocolloids Inc.
- Nuclear reactor integrated oil and gas production systems and methods of operation6 Oct 2026US 12,753,674 B2Natura Resources LLC
- Inline fracturing valve systems and methods6 Oct 2026US 12,753,683 B2Cameron International Corporation
- Turbine engine cleaning and protection system6 Oct 2026US 12,753,718 B2Yantai Jereh Petroleum Equipment & Technologies Co., Ltd.
- Self-correcting flow in subsurface wells8 Oct 2026US 2026/0309010 A1Fervo Energy Company
- Method and system for performing simultaneous hydraulic fracturing operation8 Oct 2026US 2026/0309011 A1ExxonMobil Technology and Engineering Company
- Mechanical energy assisted hydraulic fracturing8 Oct 2026US 2026/0309012 A1
- Methods and systems for performing hydraulic fracturing operations8 Oct 2026US 2026/0309013 A1ExxonMobil Technology and Engineering Company
- Mechanical energy assisted hydraulic fracturing8 Oct 2026US 2026/0309014 A1
Most cited
By later US patents
- Mobile electric power generation for hydraulic fracturing of subsurface geological formations496US 9,534,473 B2Evolution Well Services, LLC · 2017
- Method of pumping an oilfield fluid and split stream oilfield pumping systems475US 7,845,413 B2Schlumberger Technology Corporation · 2010
- Control of particulate flowback in subterranean wells379US 5,330,005 ADowell Schlumberger Incorporated · 1994
- Control of particulate flowback in subterranean wells372US 5,501,275 ADowell, a division of Schlumberger Technology Corporation · 1996
- System for pumping hydraulic fracturing fluid using electric pumps369US 8,789,601 B2U.S. Well Services, LLC · 2014