Apparatus and method for attenuating tube waves in a borehole
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United States of America Patent
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Mar 6, 2001
Grant Date -
N/A
app pub date -
Oct 6, 1999
filing date -
Oct 6, 1999
priority date (Note) -
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Abstract
In one embodiment the invention comprises a method of gathering borehole seismic data in which a borehole acoustic instrument is lowered into a borehole in the earth's surface along with a canister positioned about the instrument and a second open bottomed canister positioned below the instrument. The canisters are at least partially filled with gas after the canisters are lowered into borehole. In another embodiment the invention comprises an apparatus for reflecting tube waves in a fluid-filled borehole which includes a canister having a diameter adapted to enable the canister to be deployed within the fluid-filled borehole, and having an open lower end, and an enclosed upper end with an aperture through the upper end adapted for sealing engagement between said upper end and a conduit.
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