Electromagnetically induced acoustic well logging

Details Electromagnetically induced acoustic well logging Electromagnetically induced acoustic well logging

1990-06-29

1991-09-10

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

367912, 181106, 73578, 73668, G01V 140, G01V 1143

Patent

active

050479920

ABSTRACT:
An electromagnetic source or sources in a sonde in a well bore is caused to emit electromagnetic forces into the well casing. The electromagnetic forces cause displacement of the casing, inducing acoustic waves. The acoustic waves may be either P-waves or S-waves, depending on the type of electromagnetic source used. The response of earth formations to the acoustic waves, once detected, is used to detect fractures in the formations.

REFERENCES:
patent: 3354983 (1967-11-01), Erickson et al.
patent: 3790930 (1974-02-01), Lamel et al.
patent: 4207961 (1980-06-01), Kitsunezaki
patent: 4383591 (1983-05-01), Ogura
patent: 4700803 (1987-10-01), Mallet et al.
patent: 4751688 (1988-06-01), Paulsson

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