Pneumatic wall-locking geophone system

Patent · Tue Jan 01 00:00:00 EST 1991

OSTI ID:868041

Kuhlman, Harland L ^[1]; Cumerlato, Calvin L ^[1]; Tweeton, Daryl R ^[2]

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1. Minneapolis, MN
2. Apple Valley, MN

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.

• Research Organization: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
• Assignee: United States of America as represented by Secretary of (Washington, DC)
• Patent Number(s): US 5060751
• OSTI ID: 868041
• Country of Publication: United States
• Language: English

Related Subjects

pneumatic
wall-locking
geophone
seismic
signal
receiving
provided
boreholes
receive
waves
carrying
geophysical
investigations
pairs
opposed
plates
including
oppositely
facing
outer
surfaces
engagement
opposite
borehole
receiver
mounted
inner
surface
signals
double-acting
fluid-operated
actuator
selectively
causes
relative
movement
provide
expansion
enable
engage
walls
retraction
removed
comprise
relatively
plate
expandable
linkage
interconnects
distal
mechanically
biassed
retracted
return
event
failure
outer surfaces
inner surface
outer surface
relative movement
provide expansion
seismic receiver
oppositely facing
seismic waves
/181/175/367/