Acoustics – Geophysical or subsurface exploration – Well logging
Patent
1991-12-31
1993-07-20
Eldred, J. Woodrow
Acoustics
Geophysical or subsurface exploration
Well logging
181113, 181121, 367 75, 73152, G01V 140
Patent
active
052295540
ABSTRACT:
A downhole electro-hydraulic vertical shear wave seismic source places the reaction mass internal to the source cylindrical housing and isolates the actuator from the wellbore fluid and pressure. The clamping system of this source uses two serrated pads radiused to match the inside diameter of the casing. Hydraulic cylinders which are retracted by internal compact stacks of spring washers are used for actuating the serrated pads. A device for keeping the reaction mass in a "floating" position with actuator piston centered within the actuator cylinder is provided by suspending the reaction mass from a compact and soft urethane spring. A threaded guide rod passing vertically through this spring allows spring compression to be adjusted until the actuator piston is precisely centered with no differential hydraulic pressure across the piston.
REFERENCES:
patent: 4648478 (1987-03-01), Dedole et al.
patent: 4702343 (1987-10-01), Paulsson
patent: 4715470 (1987-12-01), Paulsson
patent: 4796723 (1989-01-01), Laurent et al.
patent: 4805725 (1989-02-01), Paulsson
patent: 4923030 (1990-05-01), Meynier
patent: 4991685 (1991-02-01), Airhart
patent: 5031717 (1991-07-01), Hardee et al.
patent: 5031719 (1991-07-01), Baria et al.
Conoco Inc.
Eldred J. Woodrow
LandOfFree
Downhole electro-hydraulic vertical shear wave seismic source does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Downhole electro-hydraulic vertical shear wave seismic source, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Downhole electro-hydraulic vertical shear wave seismic source will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1762096