Acoustics – Geophysical or subsurface exploration – Well logging
Patent
1990-07-18
1992-11-03
Eldred, J. Woodrow
Acoustics
Geophysical or subsurface exploration
Well logging
181113, 181119, 367 75, G01V 140
Patent
active
051608146
ABSTRACT:
Seismic signals are generated in an earth formation at a selected point in a wellbore by apparatus insertable in the wellbore at the distal end of a tubing string. The apparatus is adapted to receive hydraulic pressure fluid from the tubing string for deploying contactor pads in engagement with the wellbore wall and for transmitting seismic signals through the pads to the earth formation. In one embodiment a hydraulic piston is directly connected to linkage for the contactor pads and an oscillatory signal is imposed on the piston for generating vibratory seismic signals. In a second embodiment, a compressed gas-driven impactor is moved to and held in a cocked position by a hydraulically-actuated setting and latching mechanism. Hydraulic control valves and electrical operating circuits are disposed on the apparatus and may be controlled from the surface by way of a wireline cable extending through the tubing string.
REFERENCES:
patent: 3221833 (1965-12-01), Malmberg
patent: 3282371 (1966-11-01), Miller
patent: 4699240 (1987-10-01), Dedole
patent: 4702343 (1987-10-01), Paulsson
patent: 4805725 (1989-02-01), Paulsson
patent: 5018598 (1991-05-01), Sodich
patent: 5031717 (1991-07-01), Hardee et al.
Atlantic Richfield Company
Eldred J. Woodrow
Martin Michael E.
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