Acoustic body wave dampener

Details Acoustic body wave dampener Acoustic body wave dampener

1998-12-01

2000-07-04

Dang, Khanh

Acoustics

Geophysical or subsurface exploration

Well logging

181104, 181106, G01V 100

Patent

active

060824840

ABSTRACT:
An acoustic attenuator suppresses acoustic signals traveling along the body of a measurement-while-drilling (MWD) tool, making it possible to obtain acoustic measurements relating to underground formations. Shaped cavities (spherical or cylindrical) filled with a fluid have a resonance frequency that is tuned to be within the band of interest thereby attenuating acoustic signals traveling through the body at these resonance frequencies. The staggered arrangement of the cavities increases the path length for the acoustic signals and provides further attenuation. Attenuation may also be accomplished by use of a composite consisting of cylindrical layers of two different materials with thicknesses that attenuate selected frequencies. Additional attenuation is provided by lengthening the path length of a seismic signal passing through the more competent of the two materials of the composite.

REFERENCES:
patent: 5510582 (1996-04-01), Birchak et al.
patent: 5592438 (1997-01-01), Rorden et al.
patent: 5852262 (1998-12-01), Gill et al.

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