E21B 49/005
Testing the nature of borehole walls or the formation by using drilling
Official title: {Testing the nature of borehole walls or the formation by using drilling mud or cutting data}
E21B49/005 (Testing the nature of borehole walls or the formation by using drilling) appears on 666 US grants and 662 published applications in this corpus.
Search patents in E21B- Granted patents
- 666
- Published applications
- 662
- Assignees
- 218
- Inventors
- 1,542
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 7 | 0 |
| 1980 | 6 | 0 |
| 1981 | 10 | 0 |
| 1982 | 10 | 0 |
| 1983 | 8 | 0 |
| 1984 | 5 | 0 |
| 1985 | 18 | 0 |
| 1986 | 5 | 0 |
| 1987 | 8 | 0 |
| 1988 | 5 | 0 |
| 1989 | 14 | 0 |
| 1990 | 5 | 0 |
| 1991 | 6 | 0 |
| 1992 | 13 | 0 |
| 1993 | 9 | 0 |
| 1994 | 10 | 0 |
| 1995 | 3 | 0 |
| 1996 | 5 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 11 | 0 |
| 2002 | 4 | 0 |
| 2003 | 3 | 5 |
| 2004 | 1 | 4 |
| 2005 | 3 | 7 |
| 2006 | 3 | 4 |
| 2007 | 3 | 4 |
| 2008 | 8 | 10 |
| 2009 | 3 | 9 |
| 2010 | 10 | 8 |
| 2011 | 5 | 18 |
| 2012 | 2 | 9 |
| 2013 | 12 | 27 |
| 2014 | 17 | 26 |
| 2015 | 16 | 33 |
| 2016 | 19 | 26 |
| 2017 | 19 | 35 |
| 2018 | 28 | 43 |
| 2019 | 29 | 38 |
| 2020 | 47 | 47 |
| 2021 | 35 | 52 |
| 2022 | 49 | 55 |
| 2023 | 56 | 60 |
| 2024 | 43 | 47 |
| 2025 | 50 | 59 |
| 2026 | 33 | 36 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Systems and methods for determining reactivity indices for carbon dioxide sequestration29 Sep 2026US 12,747,651 B2Schlumberger Technology Corporation
- Method for processing sampled proppant during hydraulic fracturing22 Sep 2026US 12,742,385 B2Gti Energy
- Utilizing dynamics data and transfer function for formation evaluation15 Sep 2026US 12,735,981 B2Baker Hughes Oilfield Operations LLC
- Methods and systems for determining well shut-in pressures of oil and gas well drilling15 Sep 2026US 12,735,982 B2Southwest Petroleum University
- Borehole correction for resistivity LWD tools with ultrasonic log while drilling caliper25 Aug 2026US 12,716,344 B2Halliburton Energy Services.Inc.
- Fluid cell device and method for measuring drilling mud properties8 Oct 2026US 2026/0309674 A1
- Automated rig site lithology data extraction8 Oct 2026US 2026/0311455 A1Schlumberger Technology Corporation
- Methods and devices for generating flow through porous media using drill cuttings1 Oct 2026US 2026/0298081 A1University of Wyoming
- Systems and methods for discovering and recovering subsurface fluids and verification of subsurface storage fluids1 Oct 2026US 2026/0298082 A1Koloma, Inc.
- Exploration of dissolved minerals using paleogeographic reconstruction24 Sep 2026US 2026/0287784 A1Saudi Arabian Oil Company
Most cited
By later US patents
- Drilling systems with sensors for determining properties of drilling fluid downhole402US 6,176,323 B1Baker Hughes Incorporated · 2001
- Method of correlating a core sample with its original position in a borehole310US 4,542,648 AShell Oil Company · 1985
- Method of determining drilling fluid invasion301US 4,540,882 AShell Oil Company · 1985
- Method of analyzing fluid saturation using computerized axial tomography283US 4,663,711 AShell Oil Company · 1987
- Method and apparatus for measuring free hydrocarbons and hydrocarbons potential from whole core274US 5,201,219 AAmoco Corporation · 1993