Method for determining the permeability of a formation

Details Method for determining the permeability of a formation Method for determining the permeability of a formation

G - Physics

01

V

349/4

G01V 1/40 (2006.01) G01V 1/44 (2006.01)

Patent

CA 1165852

F-0791 A METHOD FOR DETERMINING THE PERMEABILITY OF A FORMATION Abstract of the Disclosure In a method for determining the permeability of a formation, a borehole is traversed with a tool 10 having a transmitter 24 for transmitting low frequency acoustic energy. The transmitter 24 is pulsed and the acoustic energy is detected by a wide band acoustic receiver 28 having a frequency response of between at least 0.1k Hz and 30k Hz. The receiver 28 is coupled to the transmitter 24 only by means of a cable 26 which has a length exceeding 5 feet (1.524 m) and preferably a length of about 15 feet (4.57 m). The amplitude of tube waves detected by the receiver 28 is determined at a plurality of locations in the borehole. The change of amplitude in tube waves at various of these locations provides a measure of permeability.

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