Low impedance down-hole acoustic source for well logging

Details Low impedance down-hole acoustic source for well logging Low impedance down-hole acoustic source for well logging

1990-11-13

1991-12-03

Lobo, Ian J.

Acoustics

Geophysical or subsurface exploration

Well logging

310321, G01V 140, H01L 4104

Patent

active

050693085

ABSTRACT:
A low impedance acoustic source suitable for used in down-hole well logging includes a mechanical transformer for impedance matching of the source to the surrounding environment. Elliptically shaped flexible beams are positioned along the long axis of an ellipse, and a pump is oriented along the long axis of the ellipse for driving the flexible beams. In a preferred embodiment the pump comprises first and second stacks of transducers which engage the flexible beams at opposing ends with the two stacks of transducers operating in a push-pull mode of operation. Rigid extension at opposing ends of the flexible beams function as levers in translating the motion of the transducers to the flexible beams. A rigid support rod is positioned along the long axis of the ellipse in engagement with the rigid extensions at fulcrum points, and an adapter associated with each stack of ceramic transducers engages and drives the rigid members about the fulcrum point. In a preferred embodiment the flexible beams permit fluid to flow around the beams for pressure equalization in deep hole applications.

REFERENCES:
patent: 4706230 (1987-11-01), Inoue et al.
patent: 4754441 (1988-06-01), Butler
patent: 4783771 (1988-11-01), Paulsson
patent: 4869349 (1989-09-01), Minear et al.
patent: 4949316 (1990-08-01), Ketahara
Toulis, W. J., "Design Problems for High Power Flextensional Transducers", Journal of Underwater Acostics, Appendix D, Soc. Am. 35, (1963).

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