Acoustics – Geophysical or subsurface exploration – Well logging
Reexamination Certificate
2005-12-13
2005-12-13
Martin, David (Department: 2837)
Acoustics
Geophysical or subsurface exploration
Well logging
C181S105000, C181S119000, C367S025000, C367S086000
Reexamination Certificate
active
06973993
ABSTRACT:
Methods and apparatus for attenuating waves in a bore hole, and seismic surveying systems incorporating the same. In one embodiment, an attenuating device includes a soft compliant bladder coupled to a pressurized gas source. A pressure regulating system reduces the pressure of the gas from the gas source prior to entering the bladder and operates in conjunction with the hydrostatic pressure of the fluid in a bore hole to maintain the pressure of the bladder at a specified pressure relative to the surrounding bore hole pressure. Once the hydrostatic pressure of the bore hole fluid exceeds that of the gas source, bore hole fluid may be admitted into a vessel of the gas source to further compress and displace the gas contained therein. In another embodiment, a water-reactive material may be used to provide gas to the bladder wherein the amount of gas generated by the water-reactive material may depend on the hydrostatic pressure of the bore hole fluid.
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Haefner Daryl
West Phillip B.
Battelle Energy Alliance, LLC
Colon Santana Eduardo
Martin David
Trask Britt P.C.
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