Televiewer image wood-grain reduction techniques
US10222501B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 2017 |
| Grant date | Mar 5, 2019 |
| Priority date | — |
| Expiry date | Apr 20, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/74
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Systems, devices, and methods for evaluating an earth formation intersected by a borehole using signals produced at a plurality of borehole depths by an ultrasonic transducer in the borehole, the signals produced by the transducer including ringdown signals from the ultrasonic transducer and echo signals from a wall of the borehole from a plurality of azimuthal orientations. Methods include using peak amplitude values and arrival time values from the signals to construct a background modulation template corresponding to at least one depth; estimating, for each respective depth of the plurality of borehole depths, an azimuthally varying interference pattern predominantly resulting from a ringdown signal for each respective depth by mapping the modulation template to arrival time values corresponding to the respective depth; and subtracting, for each respective depth, the estimated varying interference pattern from the peak amplitude values corresponding to the respective depth to generate adjusted peak amplitudes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.