Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1981-01-02
1984-02-14
Cangialosi, Sal
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
G01V 128
Patent
active
044320779
ABSTRACT:
Disclosed is a method for determining the permeability of a formation which includes the steps of traversing a bore-hole with a tool having a means for transmitting low frequency acoustic energy. The transmitting means is pulsed and the acoustic energy is detected by a first wide band receiver having a frequency response of between at least 0.1k hertz and 30k hertz. The receiver is coupled to the transmitting means only by means of a cable which has a length exceeding about 5 feet and preferably a length of about 15 feet. The amplitude of tube waves detected by the receiver is determined at a plurality of locations in the bore-hole. The change of amplitude in tube waves at various of these locations provides a measure of permeability. The receiver employed preferably comprises a cylinder of piezoelectric material having end plates at the ends of the cylinder and a passageway through one of the end plates which transmits ambient but not dynamic pressure changes.
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Alhilali Khalid A.
Zemanek, Jr. Joseph
Cangialosi Sal
Gilman M. G.
Kaiser K. R.
McKillop A. J.
Mobil Oil Corporation
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