Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through drill string or casing
Patent
1990-10-29
1993-06-22
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Wellbore telemetering
Through drill string or casing
G01V 140
Patent
active
052220494
ABSTRACT:
An improved electromechanical transducer is provided for use in an acoustic telemetry system. The transducer of this invention comprises a stack of ferroelectric ceramic disks interleaved with a plurality of spaced electrodes which are used to electrically pole the ceramic disks. The ceramic stack is housed in a metal tubular drill collar segment. The electrodes are preferably alternatively connected to ground potential and driving potential. This alternating connection of electrodes to ground and driving potential subjects each disk to an equal electric field; and the direction of the field alternates to match the alternating direction of polarization of the ceramic disks. Preferably, a thin metal foil is sandwiched between electrodes to facilitate the electrical connection. Alternatively, a thicker metal spacer plate is selectively used in place of the metal foil in order to promote thermal cooling of the ceramic stack.
REFERENCES:
patent: 3277433 (1966-10-01), Toulis
patent: 3700939 (1972-10-01), Abbott
patent: 3716828 (1973-02-01), Massa
patent: 4283780 (1981-08-01), Nardi
patent: 4302826 (1981-11-01), Kent et al.
patent: 4518888 (1985-05-01), Zabcik
Philips Export B.V., "PXE High Power Actuator for Electronic/Mechanical Interfacing," Technical Publication 165 (Jun. 1985).
Lobo Ian J.
Teleco Oilfield Services Inc.
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