Transducer for sonic logging-while-drilling

Details Transducer for sonic logging-while-drilling Transducer for sonic logging-while-drilling

G - Physics

01

V

G01V 1/44 (2006.01) G01V 1/52 (2006.01) E21B 47/01 (2006.01)

Patent

CA 2192276

An acoustic wave transducer useful in sonic logging while drilling a borehole includes an array of transducer elements mounted circumferentially around a drill collar. The elements are bonded in an elastomer ring that is received in an external groove in the collar and are protected by a shield having windows. The elements are electrically connected in parallel so that when excited by an electrical pulse, the elements generate a monopole acoustic wave that propagates out into the formation. When used as a receiver, the elements detect averaged acoustic waves from the formation around the circumference of the collar and have minimum sensitivity to multipole waves traveling through the drill collar.

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