Noise suppression drilling system
DCFirst Claim
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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Abstract
The invention encompasses improvements in noise attenuation systems for reducing the audible noise level generated during earth boring operations using a hard surfaced rotary drill bit, and in dual bore-cutting elements for performing sequential first and second bore cutting to the design bore-gauge.
43 Citations
20 Claims
- 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.
- 3. 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 first and second bore-cutting means constructed and arranged to operate at different noise generating levels with a significantly lower aggregate noise, and the first bore-cutting means being a rotary drill bit for drilling a pilot bore hole smaller than the final bore size.
- 16. 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 comprising an annular resilient collar for placement in circumscribing engagement with a portion of the drive steel column.
Specification