Minimization of drill string rotation rate effect on acoustic signal of drill sound
US11920467B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 13, 2022 |
| Grant date | Mar 5, 2024 |
| Priority date | — |
| Expiry date | Jan 13, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/614
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Systems and methods include a computer-implemented method for determining normalized apparent power. Drilling acoustic signals corresponding to a time domain and generated during drilling of a well. A fast Fourier transformation (FFT) is performed using the drilling acoustic signals to generate FFT data. Normalized FFT data is generated using normalization parameters and a drill string rotation rate record of a drill string used to drill the well. The drill string rotation rate is received during drilling. Normalized apparent power is determined from data points of a predetermined top percentage of the normalized FFT data within a lithological significant frequency range. The normalized apparent power is a measure of the power of the drilling acoustic signals and it is a function of the amplitude and frequency of the normalized FFT data. The lithological significant frequency range is a frequency range within which the drill sounds are more closely related with lithology.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.