Electro-hydraulic dipole vibrator

Details Electro-hydraulic dipole vibrator Electro-hydraulic dipole vibrator

1991-04-08

1992-01-14

Lobo, Ian J.

Acoustics

Geophysical or subsurface exploration

Well logging

181104, 367 75, G01J 140

Patent

active

050801899

ABSTRACT:
A downhole seismic shear wave source is used to generate seismic shear waves a downhole environment. At least one double headed piston rod with a third piston on the center of the rod slides laterally in the downhole tool. Each end piston head is connected to a rolling diaphragm that is secured at its edges around the periphery of the piston receiving cavity. The cavity is filled with a low viscosity non-conducting oil. A servovalve is connected to opposite sides of the center piston head to produce low frequency vibration of the source generator. A veed target rod extends between the end piston heads, past a pair of eddy current transducers (ECTs) to monitor movement of the generator and provide feedback control to the servovalve. A second downhole seismic shear wave source contains a continuous vibrator ring replaces the diaphragm/oil system and a linear variable differential transformer (LVDT) replaces the eddy current transducers as the feedback signal generator.

REFERENCES:
patent: 3221833 (1965-12-01), Malmberg
patent: 3382841 (1968-05-01), Bouyoucos
patent: 3384868 (1968-05-01), Brown et al.
patent: 4049077 (1977-09-01), Mifsud
patent: 4147228 (1979-04-01), Bouyoucos
patent: 4383591 (1983-05-01), Ogura
patent: 4483411 (1984-11-01), Mifsud
patent: 4578784 (1986-03-01), Mifsud
patent: 4649525 (1987-03-01), Angona et al.
patent: 4862990 (1989-09-01), Cole

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