Circumferential acoustic device

Details Circumferential acoustic device Circumferential acoustic device

1979-06-18

1981-10-06

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

367 31, 367911, 346 33WL, G01V 140

Patent

active

042939348

ABSTRACT:
A method and apparatus for acoustical logging wherein a plurality of transducers are spaced circumferentially in a plane perpendicular to the borehole and in close proximity to the wall of the borehole. Numerous circumferential acoustic transmission paths are defined by using some of the transducers as transmitters and others as receivers. Ultrasound is transmitted and received separately along each of the paths and amplitudes of the received waves are separately recorded to provide a side-by-side comparison of the signals. The received waves may be comprised of shear waves and compressional waves, and the shear wave amplitude may be recorded to the exclusion of later arriving waves. Proper spacing of the transmitters and receivers will produce a complete circumferential acoustic log of the borehole that can be used to detect the presence of vertical fractures.

REFERENCES:
patent: 3363719 (1968-01-01), Venghiattes
patent: 3375897 (1968-04-01), Engle et al.
patent: 3464513 (1969-09-01), Roever
patent: 3474878 (1969-10-01), Loren
patent: 3475722 (1969-10-01), White
patent: 3775739 (1973-11-01), Vogel
patent: 3794976 (1974-02-01), Obekler
patent: 3883841 (1975-05-01), Norel et al.
patent: 3949352 (1976-04-01), Vogel
patent: 4130816 (1978-12-01), Vogel et al.

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