Acoustics – Geophysical or subsurface exploration – Well logging
Patent
1990-03-27
1991-06-11
Lobo, Ian J.
Acoustics
Geophysical or subsurface exploration
Well logging
181116, 181103, 175 455, 102320, G01V 106, E21B 700, F42D 306
Patent
active
050224859
ABSTRACT:
A method and apparatus for geophysical exploration wherein a seismic wave is passed through a bore hole so at to sequentially detonate a plurality of explosive charges disposed within said bore hole at spaced intervals. A preselected seismic wave magnitude represented by a stored voltage is compared with signals generated by electro-acoustic sensors associated with each charge. When the magnitude of a seismic wave in the bore hole equals the preselected magnitude, a voltage stored on a capacitor discharges into a detonator. Means are provided for varying the stored voltage representing the preselected magnitude from the surface of the bore hole and for detonating any unexploded charges which may after the initial seismic wave passes through the bore hole. A firing circuit is armed substantially simultaneously with the initiation of the seismic wave in the bore hole. The firing circuit is armed for only approximately 0.1 to 0.5 seconds thereby preventing late detonation which destroys seismic data. The circuit may thereafter be rearmed to detonate any remaining unexploded charges in the bore hole.
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