Downhole rebound hardness measurement while drilling or wireline logging
US9291539B2 · kind B2 · utility
0Cited by
24References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 17, 2011 |
| Grant date | Mar 22, 2016 |
| Priority date | — |
| Expiry date | Dec 22, 2032 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/006
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for estimating a rock strength profile of a formation is disclosed. A tool having a testing surface is conveyed into a wellbore in the formation. The testing surface is propelled to impact the formation at a plurality of depths in the wellbore. A measurement of hardness of the formation is obtained from a rebound of the testing surface from the formation at the plurality of depths. The rock strength profile of the formation is estimated using the obtained measurements of hardness at the plurality of depths. A parameter for drilling the wellbore can be affected using the estimated rock strength profile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.