Conoco Inc.

The United States of America As Represented by the Secretary of

Paul L Buller

Jack H Cole

Delbert W Fair

James C Fowler

William L Chapman

Bobby J Thomas

John B Sinton

Marvin E Janda

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.

Downhole epicyclic motion orbital seismic source

Mobile high frequency vibrator system

A surveillance system for maintaining continuous vigil as to seismic energy generating disturbances in and around an underground mine, such system being one of permanent installation which in combination with central data processing apparatus provides a continuous data output indication of certain mine activities. The system utilizes a plurality of permanently installed, underground geophone sensors each in communication via particular ACC circuitry and signal processing circuitry to provide input through an interface logic network to a central computer equipment programmed to determine disturbance locations, certain intensities, time duration and the like.

Seismic mine monitoring system

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Ponca City, OK, United States of America

Paul L Buller