Methods of and apparatuses for transforming acoustic log signals
US11714209B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 3, 2020 |
| Grant date | Aug 1, 2023 |
| Priority date | — |
| Expiry date | Apr 14, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/63
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a method to transform logs, an acoustic logging tool inserted into a borehole includes a source and an array of receiver stations. Each station includes a receiver spaced along the tool from the source by successively greater distances. In the method, the source emits energy (I) to cause the propagation towards the stations of plural signals exhibiting paths characteristic of first and second respective modes and (II) to stimulate a receiver of each station to generate an output signal per station that indicates the signal packets and represents the modes in combination with one another. In the method, the output signals are transformed into transformed signals containing phase/amplitude information of each mode. The phase/amplitude are linked by an operator to the slowness and attenuation of the mode and the transmitter-receiver distance of the station. The phase/amplitude are used to extract slowness and attenuation information for each mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.