Acoustics – Geophysical or subsurface exploration – Well logging
Patent
1989-01-26
1992-07-21
Eldred, J. W.
Acoustics
Geophysical or subsurface exploration
Well logging
181108, 181113, 181121, 367 75, 367189, G01V 140
Patent
active
051314886
ABSTRACT:
Apparatus is described for placement in a borehole in the earth, which enables the generation of closely controlled seismic waves from the borehole. Pure torsional shear waves are generated by an apparatus which includes a stator element fixed to the borehole walls and a rotor element which is electrically driven to rapidly oscillate on the stator element to cause reaction forces transmitted through the borehole walls to the surrounding earth. Logitudinal shear waves are generated by an armature that is driven to rapidly oscillate along the axis of the borehole relative to a stator that is clamped to the borehole, to cause reaction forces transmitted to the surrounding earth. Pressure waves are generated by electrically driving pistons that press against opposite ends of a hydraulic reservoir that fills the borehole. High power is generated by energizing the elements at a power level that causes heating to over 150.degree. C. within one minute of operation, but energizing the elements for no more than about one minute.
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Cook Neville G. W.
Green Michael A.
Majer Ernest L.
McEvilly Thomas V.
Witherspoon Paul A.
Eldred J. W.
Gaither Roger S.
Moser William R.
The United States of America as represented by the United States
Valdes Miguel A.
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