Downhole epicyclic motion orbital seismic source

Details Downhole epicyclic motion orbital seismic source Downhole epicyclic motion orbital seismic source

1993-01-29

1994-06-14

Lobo, Ian J.

Acoustics

Geophysical or subsurface exploration

Well logging

181113, G01V 140

Patent

active

053212134

ABSTRACT:
The present invention relates to an improved downhole seismic source with an epicyclic eccentric weight system for the simultaneous generation of elliptically polarized shear wave seismic energy and compression wave seismic energy coupled into a borehole. The apparatus includes a cylindrical housing and a drive means or electric motor disposed in the housing which provides rotational output to an epicyclic eccentric weight system also disposed in the housing. Expandable tapered wedging collars are used to firmly secure the motor and the epicyclic eccentric weight systems within the housing. A flexible shaft interconnects the centerline of the epicyclic cylindrical roller and the motor whereby the roller receives the rotational output from the motor. The shaft rotates in one direction and the roller rotates in the opposite direction thereby producing an epicyclic motion.

REFERENCES:
patent: 4709362 (1987-11-01), Cole
patent: 4874061 (1989-10-01), Cole
patent: 5159160 (1992-10-01), Brett
patent: 5166909 (1992-11-01), Cole et al.
patent: 5229552 (1993-07-01), Cole

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