Borehole televiewer for fracture detection and cement evaluation

Details Borehole televiewer for fracture detection and cement evaluation Borehole televiewer for fracture detection and cement evaluation

1989-03-29

1991-02-12

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

181102, 181104, 181105, 367 35, G01V 140

Patent

active

049929941

ABSTRACT:
An acoustic logging system for detecting anomalies in formations surrounding a borehole. The system can be used for evaluating the formation for fractures or the bond between a well casing and the cement used to seal the space between the casing and the formation. The system utilizes at least one rotating acoustical transmitter/receiver and at least one receiver vertically spaced from the rotating transducer. The signals from both receivers are analyzed to detect the presence of anomalies, such as fractures or voids in a cement bond.

REFERENCES:
patent: 4601024 (1986-07-01), Broding
patent: 4646565 (1987-03-01), Siegfried
patent: 4665511 (1987-03-01), Rodney et al.
patent: 4802145 (1989-01-01), Mount, II
patent: 4803667 (1989-02-01), Siegfried, II
patent: 4809237 (1989-02-01), Vogel et al.
patent: 4867264 (1989-09-01), Siegfried

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