Noise suppression drilling system

  • US 6,427,782 B2
  • Filed: 12/19/2000
  • Issued: 08/06/2002
  • Est. Priority Date: 06/07/1995
  • Status: Expired due to Term
First Claim
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1. A rotary drilling system having a drill steel column for cutting bores in earth formations, comprising noise suppression means for significantly reducing the audible decibel level of drilling generated noise, said noise suppression system comprising annular means constructed and arranged for use in association with a drive steel column during drilling operations including a noise attenuating unit having a central bore to accommodate part of the steel column, said noise attenuating unit being a muffler device for placement in a bore hole circumscribing location and including sound absorbing material.

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