Composite Transducer for Downhole Ultrasonic Imaging and Caliper Measurement
First Claim
Patent Images
1. 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.
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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.
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Citations
18 Claims
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1. An apparatus configured to evaluate an earth formation, the apparatus comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 15, 16)
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9. A method of evaluating an earth formation, the method comprising:
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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. - View Dependent Claims (10, 11, 12, 13, 14)
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- 17. 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.
Specification