Tubewave damper probe for seismic applications

Acoustics – Geophysical or subsurface exploration – Well logging

Patent

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Details

367911, G01V 140

Patent

active

051719436

ABSTRACT:
A tubewave damper probe for the suppression of borehole tubewaves in seismic applications is disclosed. The damper probe is suspended into a borehole by means of a cable and is comprised of a housing, a gas-filled bladder within the housing, and a plurality of valves located on the housing. The damper probe operation is based on a modified Helmholtz resonator effect. The bladder is precharged before insertion into the borehole, and pressure variations within the borehole cause the bladder to expand or contract. The valves are designed such that expansion of the bladder causes the valves to close, and contraction of the bladder causes the valves to open. The valves also prevent over-expansion of the bladder.

REFERENCES:
patent: 4858718 (1989-08-01), Chelminski
patent: 5005666 (1991-04-01), Fairborn

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