Method for logging behind casing

Details Method for logging behind casing Method for logging behind casing

1996-07-02

1997-07-01

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

367 27, 367 32, 181105, 364422, G01V 140

Patent

active

056445504

ABSTRACT:
A method for logging a subterranean formation from within a well that has been cased and cemented is disclosed. An acoustic signal is transmitted into the formation from a pulse-echo transducer placed within the wellbore and the first casing echo and the first formation echo are detected. The amplitude and the arrival times of these two echoes, combined with some known information about the wellbore, the casing, and the cement enable several parameters to be calculated. These parameters in turn may be used to image the formation around the well.

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patent: 4916649 (1990-04-01), Gard
patent: 5001676 (1991-03-01), Broding
patent: 5274604 (1993-12-01), D'Angelo et al.
Zhou, J.; Well Logging Tech., vol. 19, #2, pp. 97-104, 1995; abst. only herewith.
Sheives et al; 61st Annu. SPE Tech Conf., Oct. 8, 1986, SPE-15436, 8 pgs; abst. herewith.
Jutter et al, SPE/IAPC Conf., Mar. 18, 1987, pp. 763-772; abst. herewith.

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