Borehole televiewer system

Details Borehole televiewer system Borehole televiewer system

1990-05-09

1991-08-27

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

367 25, 367911, 181105, G01V 140

Patent

active

050439480

ABSTRACT:
A borehole televiewer system is disclosed which includes a sonde adapted to be suspended in a borehole containing borehole fluids. A variable speed brushless DC motor within the sonde is utilized to drive a rotatable mount at selected speeds in order to maintain a rotational speed in proportion to the linear speed of the sonde through the borehole. A "quick-disconnect" transducer head, including diametrically opposed acoustic transducers, is mounted to the rotatable mount in direct contact with the borehole fluids and is utilized to repetitively transmit energy pulses at the wall of the borehole throughout each rotation. Receiver circuitry is then utilized to determine the amplitude and transit time for each reflected pulse in order to determine parameters of interest for the borehole wall. In a preferred mode of the present invention, the reflected pulses are then utilized to generate a video representation of the borehole wall in addition to providing a graphic plot. A magnetic tape storage device may also be utilized to provide long-term storage of the resultant investigation.

REFERENCES:
patent: 4030064 (1977-06-01), Elliott
patent: 4524433 (1985-06-01), Broding
patent: 4829488 (1989-05-01), Siegfried, II
patent: 4837753 (1989-06-01), Morris et al.
patent: 4876672 (1989-10-01), Petermenin et al.
"Development of a New Borehold Acoustic Televiewer for Geothermal Applications", Transactions, vol. 9, Part II, Aug. 1985, Moore et al.
"Detection of External Pipe Defects with a Modified Borehole Televiewer", Kotchure et al., SPWLA 29th Annual Logging Symposium, June 5-8, 1988.

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