Apparatus for attenuating Stoneley waves in a borehole
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United States of America Patent
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-
Feb 9, 1993
Grant Date -
N/A
app pub date -
Nov 26, 1991
filing date -
Nov 27, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus for attenuating Stoneley waves propagating in a borehole along a given direction, the borehole containing a fluid in which at least one seismic transducer is immersed. According to the invention, the apparatus comprises pressure transmission means firstly for placing in a region of the borehole where the hydrostatic pressure is not less than the hydrostatic pressure at the level of the seismic transducer, and secondly for transmitting pressure to at least one flexible hose containing a gas, the hose being disposed upstream from the seismic transducer relative to the propagation direction of the Stoneley waves. The apparatus is applicable to geological exploration by performing a seismic survey in a borehole.
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