Acoustics – Geophysical or subsurface exploration – Well logging
Patent
1976-09-17
1977-08-02
Birmiel, Howard A.
Acoustics
Geophysical or subsurface exploration
Well logging
340125D, 324 10, 181102, 181113, G01V 106
Patent
active
040390420
ABSTRACT:
An acoustical sparker probe apparatus is described for generating a high energy acoustical pulse at a frequency between 600 hz and 10 khz in a borehole having a diameter between 50 mm and 100 mm. The apparatus includes an uphole electronic system having a low voltage AC power source which is directed through an electrical cable to a borehole probe that is moved along the length of the borehole. The borehole probe has a sparker section with electrodes for generating a high energy acoustical pulse when a high energy electrical spark discharge is created between the electrodes. The probe has a high voltage DC energy section with a voltage multiplying and electrical energy storage for receiving the low voltage AC from uphole and creating and storing over 100 joules of electrical energy at a voltage above 1000 volts within the probe. The probe has a triggering network for rapidly discharging the high voltage electrical energy across the electrodes at above 5000 amp for 10 .mu.sec to create the high energy acoustical pulse. The probe has a discharge detection network for determining the occurrence of the peak discharge and generating a discharge signal that is transmitted uphole to a lapse time recorder. The energy storage network includes a plurality of cylindrical electrolytic capacitors physically mounted end-to-end in the probe.
REFERENCES:
patent: 2679205 (1954-05-01), Piety
patent: 2708485 (1955-05-01), Vogel
patent: 3368194 (1968-02-01), Cholet et al.
patent: 3537542 (1970-11-01), Dubois et al.
Edwards Richard C.
Wilson Richard L.
Birmiel Howard A.
Holosonics, Inc.
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