E21B 49/008
Testing the nature of borehole walls: by injection test
Official title: {by injection test; by analysing pressure variations in an injection or production test, e.g. for estimating the skin factor (measuring pressure E21B47/06)}
E21B49/008 (Testing the nature of borehole walls: by injection test) appears on 634 US grants and 597 published applications in this corpus.
Search patents in E21B- Granted patents
- 634
- Published applications
- 597
- Assignees
- 204
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- Latest grant
- 25 Aug 2026
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|---|---|---|
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| 1982 | 2 | 0 |
| 1983 | 4 | 0 |
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| 1997 | 11 | 0 |
| 1998 | 6 | 0 |
| 1999 | 7 | 0 |
| 2000 | 9 | 0 |
| 2001 | 11 | 3 |
| 2002 | 7 | 10 |
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| 2022 | 36 | 31 |
| 2023 | 36 | 35 |
| 2024 | 31 | 31 |
| 2025 | 32 | 39 |
| 2026 | 16 | 15 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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