Apparatus for generating multiple seismic signals in a wellbore

Details Apparatus for generating multiple seismic signals in a wellbore Apparatus for generating multiple seismic signals in a wellbore

1987-09-17

1988-12-27

Tarcza, Thomas H.

Acoustics

Geophysical or subsurface exploration

Well logging

181113, 181116, 181103, G01V 140

Patent

active

047934352

ABSTRACT:
Multiple downhole seismic signals are generated by an apparatus comprising one or more elongated rod segments insertable in a borehole and provide with spaced-apart predetermined lengths of Primacord explosive charge helically wrapped on the exterior of the rod segment and spaced apart by circumferential baffles supported on the rod segment. The charges are selectively fired through a motor actuated selector switch and a switch stepping and firing circuit including only two conductors and blocking diodes for imposing signals of opposite polarity on the selector switch and its actuating motor.

REFERENCES:
patent: 2871784 (1959-02-01), Blair
patent: 3768408 (1973-10-01), Hallmark
patent: 4208966 (1980-06-01), Hart
patent: 4284006 (1981-04-01), Davis
patent: 4286520 (1981-09-01), Davis

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