E21B 49/02
Testing the nature of borehole walls: by mechanically taking samples of the
Official title: by mechanically taking samples of the soil
E21B49/02 (Testing the nature of borehole walls: by mechanically taking samples of the) appears on 680 US grants and 584 published applications in this corpus.
Search patents in E21B- Granted patents
- 680
- Published applications
- 584
- Assignees
- 251
- Inventors
- 1,575
- Latest grant
- 29 Sep 2026
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|---|---|---|
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| 1981 | 4 | 0 |
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| 1999 | 13 | 0 |
| 2000 | 17 | 0 |
| 2001 | 11 | 2 |
| 2002 | 7 | 9 |
| 2003 | 4 | 2 |
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| 2021 | 52 | 45 |
| 2022 | 35 | 45 |
| 2023 | 57 | 38 |
| 2024 | 42 | 33 |
| 2025 | 27 | 31 |
| 2026 | 16 | 11 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
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- Sampling pipe of a sampling arrangement21 Jul 2026US 12,687,077 B2Erimek Oy
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- Triaxial stress simulation method for water storage roadways in abandoned mine pumped storage20 Aug 2026US 2026/0243166 A1Guizhou University
- Method for extrapolating the representativeness of the classes of the data of oil well wall rock lateral samples30 Jul 2026US 2026/0218609 A1Petroleo Brasileiro S.A. - Petrobras
- Sidewall Tubular Cleaner and Sampling Tool9 Jul 2026US 2026/0193983 A1Saudi Arabian Oil Company
- Classification of pore or grain types in formation samples from a subterranean formation21 May 2026US 2026/0139579 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Method of determining drilling fluid invasion301US 4,540,882 AShell Oil Company · 1985
- Wellbore milling and drilling190US 5,887,655 AWeatherford/Lamb, Inc. · 1999
- Wellbore milling-- drilling166US 5,887,668 AWeatherford/Lamb, Inc. · 1999
- Modified formation testing apparatus and method154US 6,157,893 ABaker Hughes Incorporated · 2000
- Modified formation testing apparatus with borehole grippers and method of formation testing110US 6,581,455 B1Baker Hughes Incorporated · 2003