Composite Transducer for Downhole Ultrasonic Imaging and Caliper Measurement
AssigneeBaker Hughes Incorporated
InventorsRoger R. Steinsiek, Douglas J. Patterson, Charles E. Redding, Anjani R. Achanta
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Abstract
A transducer assembly for downhole imaging includes a 1-3 Piezoelectric composite transducer of high Q ceramic rods in a polymer matrix. The assembly also includes a Teflon® window, a fluid-filled cavity adjacent to the window, and impedance matching material between the composite transducer and the fluid. The transducer is positioned to reduce the reverberation time.
Claims18
An apparatus configured to evaluate an earth formation, the apparatus comprising:
- a rotatable transducer assembly;
- a composite transducer on the rotatable transducer assembly configured to propagate an acoustic signal through an acoustically transparent window into a borehole and receive a reflection from a wall of the borehole;
- and
- at least one processor configured to use the reflection obtained at a plurality of orientations of the transducer during rotation of the transducer assembly to provide an image of the earth formation.
A method of evaluating an earth formation, the method comprising:
- conveying a rotatable transducer assembly into a borehole;
- using a composite transducer on the rotatable transducer assembly configured to propagate an acoustic signal through an acoustically transparent window into the borehole and receive a reflection from a wall of the borehole;
- and
- using the reflection obtained at a plurality of orientations of the transducer during rotation of the transducer assembly to provide an image of the earth formation.
A computer-readable medium accessible to at least one processor, the computer-readable medium including instructions which enable the at least one processor to use a reflected signal from a borehole wall resulting from generation of an acoustic signal by a composite transducer on a rotatable transducer assembly in the borehole and transmission of the generated acoustic signal through an acoustically transparent window on the transducer assembly into the borehole.
Dependencies are inferred from the claim text.