Directional acoustic logger apparatus and method

Details Directional acoustic logger apparatus and method Directional acoustic logger apparatus and method

1987-07-31

1988-05-17

Suchfield, George A.

Wells

Processes

With indicating, testing, measuring or locating

166 551, 166 66, 166285, 166297, E21B 3313, E21B 4319, E21B 4710

Patent

active

047444169

ABSTRACT:
An acoustic logging apparatus and method are disclosed for determining the direction of a subsurface noise source, such as a blowout well or fluid channeling behind well casing. The apparatus comprises cylindrical piezoelectric crystal transducers processed to buck each other. The method employs such an apparatus and includes generating and observing output from the crystals. The direction of the noise relative to the position of the apparatus is indicated by determining the position of the crystal transducers when their phase and amplitude differences are at a minimum. The transducer leading in phase at a point perpendicular to said position is the transducer closest to the noise source and is used to indicate the absolute direction of the noise.

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