Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1987-02-03
1989-07-11
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367 69, G01V 140
Patent
active
048478148
ABSTRACT:
A system is disclosed for creating a three-dimensional image of data obtained from scanning a borehole wall with an acoustic transducer. Each scan produces an orientation pulse and a series of signals, including a fire pulse and echo signals. The system uses the transit times of the echo signals to modulate the geometry of the three-dimensional image, and uses the amplitudes of the echo signals to control the gray scale shading of the image. In one embodiment, a counting means keeps track of the angular position of the transducer, a ramp generating means produces a ramp voltage proportional to the elapsed time since the fire pulse, a sine table means and a sine conversion means produce a sine signal proportional in amplitude to the ramp voltage, a cosine table means and a cosine conversion means produce a cosine signal porportional in amplitude to the ramp voltage, and a monitoring means displays points on the monitoring means when the echo signals are received. The points are moved radially from the center of a circle in a direction controlled by the sine and cosine signals, and the intensities of the points are proportional to the amplitudes of the echo signals.
REFERENCES:
patent: 3434568 (1969-03-01), Caldwell
patent: 4633448 (1986-12-01), Koeijmans
"Interpretation and Application of Borehole Televiewer Surveys", Taylor, T. J., SPWLA 24th Logging Symposium, Jun. 1983.
"Development of a New Borehole Acoustic Televiewer . . . ", Moore et al., Transactions, vol. 9, Part II, Aug. 1985.
Chevron Research Company
Keeling E. J.
LaPaglia S. R.
Lobo Ian J.
Schaal E. A.
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