ELECTROMECHANICAL CONVERTER FOR ACOUSTIC COMMUNICATION CHANNEL Russian patent published in 2006 - IPC E21B47/16 

FIELD: well drilling, particularly devices to convey borehole information via acoustic communication channel during well drilling.

SUBSTANCE: electromechanical converter comprises a set of piezoelectric discs with central round orifices. The set is located between front and rear steel cylindrical covering plates and is tightened with pin passing through above orifices. The pin is created of material having product of density by modulus of elasticity of not more than that of covering plate material, namely steel. Protective container is secured to outer surface of front cylindrical covering plate. The container has connection unit for measuring block attachment. The front cylindrical covering plate is fixedly secured to inner partition of sub. The inner partition is transversal to sub axis and has through orifices. The sub has conical locking threads created on both sub ends adapted to arrange thereof in any drilling string section. Rear steel cylindrical covering plate includes permanent and replaceable trimming sections.

EFFECT: increased operational reliability.

3 dwg