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US 4,283,780 AGranted
Resonant acoustic transducer system for a well drilling string
AssigneeSperry Corporation
InventorAnthony P. Nardi
Life of this patent
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Abstract
For use in transmitting acoustic waves propated along a well drilling string, a piezoelectric transducer is provided operating in the relatively low loss acoustic propagation range of the well drilling string. The efficiently coupled transmitting transducer incorporates a mass-spring-piezoelectric transmitter combination permitting a resonant operation in the desired low frequency range.
Claims7
In a system for the acoustic propagation of data along a bore-hole drilling string, primarily during drilling operation thereof, an acoustic transducer physically coupled to said bore-hole drilling string and comprising:
- a piezoelectric transmitter having a first axis and adapted for compression and elongation along said first axis when excited by a variable electric field disposed thereacross,
- a first fastener extending through said piezoelectric transducer means along said first axis,
- a second fastener for affixing said piezoelectric transmitter means against a surface of said bore-hole drilling string and for holding said piezoelectric transmitter in cooperation with said first fastener in substantially fixed compression,
- a corrugated tubular bellows-like spring affixed to and extending from said second fastener opposite said piezoelectric transmitter and having an axis colineal with said first axis, and
- an elongate cylindrical mass having a cylindrical axis colinear with said first axis and extending from and coupled integrally with said corrugated tubular bellows-like spring into the interior thereof opposite said second fastener,
- said first axis extending substantially parallel to the axis of said bore-hole drilling string.
3 more elements
Dependencies are inferred from the claim text.