Highly-directional acoustic source for use in borehole surveys

Details Highly-directional acoustic source for use in borehole surveys Highly-directional acoustic source for use in borehole surveys

1975-04-25

1976-08-10

Wilbur, Maynard R.

Communications: electrical

Selective

Interrogation response

181104, 181102, 181108, G01V 140

Patent

active

039744760

ABSTRACT:
A highly directional acoustic source for use in a well logging system wherein a fluid-filled tube is provided with a transducer at one end and an acoustic reflector at the other end to reflect the acoustic beam into the formation. The transducer is excited at two frequencies whose difference is the desired frequency and the tube is made sufficiently long to produce parametric generation of the difference frequency.

REFERENCES:
patent: 2825044 (1958-02-01), Peterson
patent: 3015801 (1962-01-01), Kalbfell
patent: 3504758 (1970-04-01), Dueker
patent: 3542150 (1970-11-01), Youmans

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