Method and apparatus for ultrasonic scanning of a borehole havin

Details Method and apparatus for ultrasonic scanning of a borehole havin Method and apparatus for ultrasonic scanning of a borehole havin

1991-05-14

1992-11-17

Lobo, Ian J.

Acoustics

Geophysical or subsurface exploration

Well logging

367 25, 367 26, 367 69, 181104, G01V 140

Patent

active

051645483

ABSTRACT:
A borehole televiewer is modified to provide an improved signal-to-noise ratio by utilizing a series of receivers arranged in a planar array configuration with respect to a centrally located transmitting transducer. The array covers at least a 90.degree. quadrant of the tool, extending approximately 45.degree. on either side of the transducer to allow the receivers to capture all primarily reflected signals, both the specular component as well as the vertical and horizontal components of the scattered reflections. The signal-to-noise ratio is further enhanced by the use of a noise-dependent timing means, as well as signal conditioning and detection circuits for each of the receivers in the array.

REFERENCES:
patent: 4446540 (1984-05-01), Zimmer
patent: 4646565 (1987-03-01), Siegfried
patent: 4867264 (1989-09-01), Siegfried

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