Monopole acoustic transmitter ring comprising piezoelectric...

Details Monopole acoustic transmitter ring comprising piezoelectric... Monopole acoustic transmitter ring comprising piezoelectric...

G - Physics

01

V

G01V 1/02 (2006.01) E21B 17/16 (2006.01)

Patent

CA 2668263

A monopole acoustic transmitter for logging-while-drilling comprising as a ring that comprises one or more piezoelectric arc segments. The ring is oriented in a plane whose normal is essentially coincident with the major axis of a logging tool in which it is disposed. The ring disposed within a recess on the outer surface of a short, cylindrical insert. The insert is inserted into a drill collar, rather than into the wall of the collar. The ring can comprise a continuous ring of piezoelectric material, or alternately arc segments or active ring segments of piezoelectric ceramic bonded to segments of other materials such as alumina to increase the frequency or heavy metals such as tungsten to reduce the frequency. The material and dimensions of the material used in-between the piezoelectric segments is chosen to alter the frequency of the ring.

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