The acoustic isolator is positioned between the bit and the transmitting transducer, it can attenuate a variety offront end of the drill noise signal to avoid the acoustic noise signal propagation along the drill collar, affecting the acousticsignal transmission and used to weaken the influence of downlink acoustic signal with the uplink channel produced by thetransducer. This paper improved the characteristic analysis of tapered acoustic transmission model, designed of the sizeand structure of the acoustic isolator which has the transmission frequency channel of in 700~800Hz and 1200~1300Hzinterval.
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