Acoustic borehole logging

Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging

Patent

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Details

181104, G01V 100

Patent

active

050016768

ABSTRACT:
A logging tool is lowered in a borehole. The tool is positioned so that the transducer is offset from the axis of the borehole. The transducer transmits acoustic energy such that it strikes the borehole wall or casing at an incident angle that directs reflections from the borehole wall away from the transducer and at the same time allows transmission into the surrounding formations or cement in the borehole annulas between the casing and the borehole wall. Reflections of the transmitted acoustic energy from anomalies within the surrounding formations as well as cement in the annulas are received by the transducer.

REFERENCES:
patent: 3406779 (1968-10-01), Zemanek, Jr.
patent: 3406780 (1968-10-01), Zemanek, Jr.
patent: 3503038 (1970-03-01), Baldwin
patent: 3511334 (1970-05-01), Zemanek, Jr.
patent: 3518679 (1970-06-01), Baldwin et al.
patent: 3550075 (1970-12-01), Hilchie et al.
patent: 3553640 (1971-01-01), Zemanek, Jr.
patent: 3668619 (1972-06-01), Dennis
patent: 3949352 (1976-04-01), Vogel
patent: 4255798 (1981-03-01), Havira
patent: 4641724 (1987-02-01), Chow et al.
patent: 4852069 (1989-07-01), Clerke et al.
patent: 4885723 (1989-12-01), Havira et al.
Article entitled "Elastic Waves in Layered Media", by W. Maurice Ewing.
Society of Petroleum Engineers Article (SPE 15436) entitled "A Comparison of New Ultrasonic Cement and Casing Evaluation Logs with Standard Cement Bond Logs".
Article entitled "Ultrasonic Cement Bond Evaluation", by R. M. Havira, dated Mar. 18, 1982.

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