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Field test of the drill-bit vibration signal detection using portable seismometers

YANG Wei1,GE Hong-kui1,NING Jing1,LIN Jian-min2(1.Institute of Geophysics,China Earthquake Administration,Beijing 100081,China;2.University of Science and Technology of China,Hefei 230026,China)  
It is a important way to explore the undrilled formations by recording the drill-bit vibration signal while drilling,namely SWD.SWD is helpful to eliminate the geological uncertainty and potential hazard.By analyzing the signal characteristic of the drill-bit vibration and performance difference of traditional multi-channel geophones instrument and the portable digital seismometers,we proposed a new way to detect the seismic signal while drilling.In it the advanced portable seismometers are used as transducers in a array.Seismometers with high sensitivity will record the vibration signal continuously while drilling.The preliminary field experiment shows this SWD scenario is feasible.The signal to noise ratio(S/N) obtained by seismometers is higher than geophones.This new approach can be operated easily by drilling engineers and opens a new way to the SWD technique.
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