Method and apparatus for suppressing waves in a borehole

Acoustics – Geophysical or subsurface exploration – Well logging

Reexamination Certificate

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C181S118000, C166S202000, C166S206000, C367S035000, C367S057000, C367S086000, C367S176000, C367S911000, C073S152360, C073S152320, C073S152340

Reexamination Certificate

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06951262

ABSTRACT:
Methods and apparatus for suppression of wave energy within a fluid-filled borehole using a low pressure acoustic barrier. In one embodiment, a flexible diaphragm type device is configured as an open bottomed tubular structure for disposition in a borehole to be filled with a gas to create a barrier to wave energy, including tube waves. In another embodiment, an expandable umbrella type device is used to define a chamber in which a gas is disposed. In yet another embodiment, a reverse acting bladder type device is suspended in the borehole. Due to its reverse acting properties, the bladder expands when internal pressure is reduced, and the reverse acting bladder device extends across the borehole to provide a low pressure wave energy barrier.

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