Method and apparatus for logging a borehole

Details Method and apparatus for logging a borehole Method and apparatus for logging a borehole

1987-04-10

1989-06-06

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 86, G01V 140

Patent

active

048377538

ABSTRACT:
Method and apparatus for logging a borehole of the type in which an acoustic energy signal scans the borehole wall at a plurality of different depths thereby generating signals reflected from a reflecting boundary which are indicitative of the condition of the reflecting boundary. A downhole microcomputer generates a sync signal for firing a transducer thereby directing an acoustic pulse toward the borehole wall. The transducer is rotated by a stepper motor. The computer synchronizes the number of transducer pulses with the number of stepper motor pulses thereby generating a constant number of transducer pulses per motor revolution. Reflected acoustic energy generates an electrical pulse which is amplified and summed with a signal relating to the rotational orientation of the transducer and the occurrence of the transducer firing pulse. The summed signal provides information relating to the condition of the reflecting boundary and may be used to generate a video image thereof.

REFERENCES:
patent: Re31074 (1982-11-01), Nolte
patent: 3426865 (1969-02-01), Henry
patent: 3668619 (1972-06-01), Dennis
patent: 4415895 (1983-11-01), Flagg
patent: 4463378 (1984-07-01), Rambow
patent: 4524433 (1985-06-01), Broding
patent: 4597183 (1986-07-01), Broding
patent: 4601024 (1986-07-01), Broding
patent: 4691307 (1987-09-01), Rambow
patent: 4740930 (1988-04-01), Broding
Moore et al., "Development of a New Borehole Acoustic Televiewer . . . ," Transactions, vol. 9, Part 2, 8/85.

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