Methods of evaluating rock properties while drilling using downhole acoustic sensors and telemetry system
US9624768B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 20, 2012 |
| Grant date | Apr 18, 2017 |
| Priority date | — |
| Expiry date | Jun 21, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Methods of identifying rock properties in real-time during drilling, are provided. An example of method includes connecting a downhole sensor subassembly between a drill bit and a drill string, operably coupling acoustic sensors to a downhole processor, operably coupling a borehole telemetry system, downhole and surface data transmitting interfaces, and a surface computer to the downhole data transmitting interface. The method also includes receiving raw acoustic sensor data resulting from rotational contact of the drill bit with rock by the downhole processor, transforming the raw acoustic sensor data into the frequency domain, filtering the transformed data, and deriving acoustic characteristics from the filtered data. The method also includes the surface computer receiving the acoustic characteristics and deriving petrophysical properties from the acoustic characteristics directly or by utilizing a petrophysical properties evaluation algorithm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.