Acoustics – Geophysical or subsurface exploration – Well logging
Patent
1990-09-14
1991-10-29
Kyle, Deborah L.
Acoustics
Geophysical or subsurface exploration
Well logging
181108, 181401, 367 25, 367 86, 367912, 175 50, G01V 140
Patent
active
050607510
ABSTRACT:
A seismic signal receiving system is provided for use in boreholes to receive seismic waves in carrying out geophysical investigations. The system includes three pairs of opposed plates, each of the pairs of plates including oppositely facing outer surfaces for engagement with opposite sides of a borehole. A seismic receiver is mounted on the inner surface of each of the plates for receiving seismic signals. A double-acting, fluid-operated actuator selectively causes relative movement of the plates of the pairs of plates away from each other to provide expansion thereof so as to enable the plates to engage the walls of a borehole and selectively causes relative movement of the plates of the pairs of plates toward each other to provide retraction thereof so as to enable the system to be removed from a borehole. The pairs of plates each comprise a relatively long plate and a relatively short plate. An expandable linkage interconnects the long plates at the distal ends thereof. The plates are mechanically biassed into the retracted state so that the plates return to this state in the event of a system failure.
REFERENCES:
patent: 4744438 (1988-05-01), Ruzie et al.
patent: 4844197 (1989-07-01), Maissa
Cumerlato Calvin L.
Kuhlman Harland L.
Tweeton Daryl R.
Eldred J. Woodrow
Koltos E. Philip
Kyle Deborah L.
The United States of America as represented by the Secretary of
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