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Title: Acoustic transducer

An acoustic transducer comprising a one-piece hollow mandrel into the outer surface of which is formed a recess with sides perpendicular to the central axis of the mandrel and separated by a first distance and with a bottom parallel to the central axis and within which recess are a plurality of washer-shaped discs of a piezoelectric material and at least one disc of a temperature-compensating material with the discs being captured between the sides of the recess in a pre-stressed interference fit, typically at 2000 psi of compressive stress. The transducer also includes a power supply and means to connect to a measurement device. The transducer is intended to be used for telemetry between a measurement device located downhole in an oil or gas well and the surface. The transducer is of an construction that is stronger with fewer joints that could leak fluids into the recess holding the piezoelectric elements than is found in previous acoustic transducers.
Inventors:
 [1]
  1. (Cedar Crest, NM)
Issue Date:
OSTI Identifier:
871300
Assignee:
Sandia Corporation (Albuquerque, NM) SNL
Patent Number(s):
US 5703836
Contract Number:
AC04-94AL85000
Research Org:
SANDIA CORP
Country of Publication:
United States
Language:
English
Subject:
acoustic; transducer; comprising; one-piece; hollow; mandrel; outer; surface; formed; recess; perpendicular; central; axis; separated; distance; bottom; parallel; plurality; washer-shaped; discs; piezoelectric; material; disc; temperature-compensating; captured; pre-stressed; interference; fit; typically; 2000; psi; compressive; stress; power; supply; means; connect; measurement; device; intended; telemetry; located; downhole; oil; gas; construction; stronger; fewer; joints; leak; fluids; holding; elements; found; previous; transducers; interference fit; piezoelectric element; acoustic transducer; central axis; outer surface; power supply; piezoelectric material; electric element; piezoelectric elements; compressive stress; device located; hollow mandrel; acoustic transducers; measurement device; transducer comprising; electric elements; /367/

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