Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1986-10-03
1987-11-10
Kyle, Deborah L.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
181104, 181106, 181401, 367151, G01V 140
Patent
active
047062282
ABSTRACT:
A spark discharge acoustic pulse transducer for borehole operation provides an insulating ceramic barrier which contains a small cross-section aperture separating two bodies of electrolyte through which the two zones of liquid make contact. An electrical arc discharge is caused to occur through the aperture to produce a transient pressure pulse and associated acoustic pulse which is coupled to the geologic formation at the borehole wall. The specific shape and geometry of the aperture channel in the insulating barrier being exponentially shaped provides a means for controlling the waveform and frequency spectrum of the acoustic pulse. The transducer has an elastic outer housing and an elastic inner housing with hydraulic fluid between the inner and outer housings. The pressure of the hydraulic fluid may be increased to expand the outer housing against a borehold prior to a spark discharge. The transducer is also provided with a system for venting gas produced as a result of the spark discharge. The transducer is designed to produce asymmetrical forces on the borehole wall in the azimuthal plane about the discharge chamber axis.
REFERENCES:
patent: 3221833 (1965-12-01), Malmberg
patent: 3403375 (1968-09-01), Wright, Jr. et al.
patent: 3428940 (1969-02-01), Huckabay
patent: 3458858 (1969-07-01), Wright
patent: 3718205 (1973-02-01), Fair et al.
patent: 3740708 (1973-06-01), Phillips
patent: 3991850 (1976-11-01), Escaron
patent: 4039042 (1977-08-01), Edwards et al.
patent: 4651311 (1987-03-01), Owen et al.
H. A. Wright, Jr., The Electrodeless Spark Underwater Sound Source, Jan. 8, 1970, entire report is pertinent, especially pp. 17-23.
Owen Thomas E.
Schroeder Edgar C.
Kyle Deborah L.
Smith Richard J.
Southwest Research Institute
Steinberger Brian S.
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