Analysis of drill-bit data: preliminary results , by Clement Kostov and Luigi Zanzi

The concept of an experiment using the drill-bit signal as a downhole seismic source is presented. The first step in the processing of data from such experiments is to separated the drill-bit signal from the noise generated by surface sources; then a variety of applications taking advantage of the source location can be considered. We discuss methods for the analysis of the temporal and spatial characteristics of drill-noise data; the application of these methods to field data from a preliminary field survey allow us to identify strong narrow-band sources of noise at the surface.


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