Method for reducing noise effects in acoustic signals transmitted along a pipe structure
US5303203A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 10, 1992 |
| Grant date | Apr 12, 1994 |
| Priority date | — |
| Expiry date | Jul 10, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/32
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of analyzing vibrations transmitted along a structure such as a drill string is disclosed. The detected vibrations include both axial and torsional vibrations generated from the same location, so that the time delay between the two, due to the difference in axial and torsional velocities, can be determined. After deconvolution to take into account the non-ideal frequency response of the structure, such deconvolution preferably retaining the values of the transmission time for each component, one of the time series is shifted by the amount of the time delay, so that the vibrations generated from the same location coincide. A weighted sum of the two representations will provide reinforcement of the desired signal. The method may be used in determining a seismic source signature in prospecting where a drill bit is the source, in analyzing drilling parameters from drill string vibrations, and in stress wave telemetry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.