Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1983-08-24
1987-03-10
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
367 27, G01V 140
Patent
active
046495266
ABSTRACT:
The inventive multipole acoustic wave logging method includes the steps of introducing a 2.sup.n -pole acoustic wave into a virgin earth formation surrounding a borehole but separated from the borehole by an invaded zone, where n is an integer greater than zero, and detecting the refracted arrival of the 2.sup.n -pole acoustic wave. The inventive apparatus includes means, separated from the borehole wall during operation, for generating a 2.sup.n -pole acoustic wave that will propagate through the borehole fluid and thereafter into the virgin earth formation. If the 2.sup.n -pole acoustic wave is a compressional wave, the compressional wave velocity of the virgin formation is determined from repeated measurements, at successively increased longitudinal spacings between the points of generation and detection of the 2.sup.n -pole wave, of the time interval between detections of the refracted arrival of the 2.sup.n -pole acoustic wave by the two detectors. If the 2.sup.n -pole acoustic wave is a shear wave, the shear wave velocity of the virgin formation is similarly determined. The radius of the invaded zone may be determined from the compressional wave velocity in the virgin formation and in the invaded zone or from the shear wave velocity in the virgin formation and in the invaded zone.
REFERENCES:
patent: 3237153 (1966-02-01), Blizard
patent: 3312934 (1967-04-01), Stripling et al.
patent: 3325780 (1967-06-01), Horan
patent: 3593255 (1971-07-01), White
patent: 4312052 (1982-01-01), Vogel et al.
Aron, J. et al, "Formation Compressional and Shear Interval-Transit-Time Logging by Means of Long Spacings and Digital Techniques", 10-3-78.
J. E. White, "The Hula Log: A Proposed Acoustic Tool," Presented at the 8th SPWLA Conference, Denver (1967).
Winbow, "How to Separate Compressional and Shear Arrivals in a Sonic Log," presented and distributed to Attendees of the 50th Annual International Meeting of the Society of Exploration Geophysicists, Houston, Tex., Nov. 17-20, 1980.
Baker Lawrence J.
Winbow Graham A.
Equitz Alfred A.
Exxon Production Research Co.
Pihulic Daniel T.
Tarcza Thomas H.
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