Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1985-10-21
1989-01-17
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
367 35, G01V 124
Patent
active
047992000
ABSTRACT:
According to the method an acoustic transmitter/receiver tool is lowered in measured manner down a borehole. The tool possesses separate transducers for transmitting and receiving sound waves and includes at least one pair of spaced apart transmitter and receiver spacing. As it is lowered, the tool is caused to repetitively transmit sound waves and on each occasion the waveforms of the echoes received by the tool are recorded in relation to the spacing. Fractures are detected by processing portions of the waveforms which are representative of at least one of two different local effects corresponding to fractures, which effects are amplitude peaks due to a local increase in acoustic coupling, and criss-cross patterns due to mode conversion.
REFERENCES:
patent: 3050150 (1962-08-01), Tixier
patent: 3205941 (1965-09-01), Walker
patent: 3356177 (1967-12-01), Loren
patent: 3406766 (1968-10-01), Henry
patent: 3474878 (1969-10-01), Loren
patent: 3775739 (1973-11-01), Vogel
patent: 4280200 (1981-07-01), Silverman
"Acoustic Propagation in the Vicinity of Fractures which interest a Fluid-Filled Borehole"; Frederick L. Paillet; SPWLA 21st Symposium, Jul. 1980.
"Applications of Median Filtering to Deconvolution, Pulse Estimation, and Statistical Editing of Seismic Data"; J. Bee Bednar; Geophysics, vol. 48, No. 12; Dec. 83.
"Using Compressional and Shear Amplitudes for the Location of Fractures"; R. L. Morris et al., SPE Fall Meeting Paper; New Orleans; Oct. 1963.
"Investigation of Acoustic Boundary Waves & Interference Patterns as Techniques for Detecting Fractures"; E. A. Koerperich; SPE-AIME; Aug. 1978.
"Formation Compressional and Shear Interval-Transit-Time Logging Means of Long . . . "; J. Aron et al.; SPE of Aime Meeting Paper; Oct. 1978.
Garrana Henry N.
Schlumberger Technology Corporation
Swann Tod R.
Tarcza Thomas H.
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