Apparatus for attenuating Stoneley waves in a borehole

Details Apparatus for attenuating Stoneley waves in a borehole Apparatus for attenuating Stoneley waves in a borehole

1991-11-26

1993-02-09

Moskowitz, Nelson

Acoustics

Geophysical or subsurface exploration

Well logging

181105, 181122, 367 25, 367 31, 367911, 175 50, 73152, G01V 140

Patent

active

051855038

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.

REFERENCES:
patent: 2350371 (1944-06-01), Smith
patent: 3054471 (1962-09-01), Knudsen
patent: 4815049 (1989-03-01), Konrad
patent: 4858718 (1989-08-01), Chelminski

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