Patent US4282588A successfully refreshed from Google Patents.
US4282588A
Expired / Lapsed
US
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Resonant acoustic transducer and driver system for a well drilling string communication system
Assignee: Unisys Corp
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Filing: 1980-01-21
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Granted: 1981-08-04
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Expires: 2000-01-21
Abstract
Abstract The acoustic data communication system includes an acoustic transmitter and receiver wherein low frequency acoustic waves, propagating in relatively loss free manner in well drilling string piping, are efficiently coupled to the drill string and propagate at levels competitive with the levels of noise generated by drilling machinery also present in the drill string. The transmitting transducer incorporates a mass-spring piezoelectric transmitter and amplifier combination that permits self-oscillating resonant operation in the desired low frequency range.
Inventors
- 👤 Gary J. Chanson
- 👤 Alexander M. Nicolson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:51
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/12; E21B47/14; E21B47/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
147 words
A system for the acoustic propagation of a data bearing carrier signal along a bore-hole drilling string including coupled hollow pipe sections, at least one of said hollow pipe sections having a first axis and a closed cavity in the wall thereof, said closed cavity having a second axis parallel to and offset from said first axis, said system comprising: a piezoelectric transmitter adapted for compression and elongation along said second axis when subjected to an electric field parallel to said second axis, said piezoelectric transmitter being affixed to a surface of said closed cavity, a cylindrical spring affixed to said piezoelectric transmitter opposite said surface, an elongate mass having an axis collinear with said second axis and affixed to said cylindrical spring opposite said piezoelectric transmitter, an accelerometer fixedly coupled to said elongate mass, and an amplifier responsive to said accelerometer for driving said piezoelectric transmitter.
Claim 2
Independent Claim
147 words
A system for the acoustic propagation of a data bearing carrier signal along a bore-hole drilling string including coupled hollow pipe sections, at least one of said hollow pipe sections having a first axis and a closed cavity in the wall thereof, said closed cavity having a second axis parallel to and offset from said first axis, said system comprising: a piezoelectric transmitter adapted for compression and elongation along said second axis when subjected to an electric field parallel to said second axis, said piezoelectric transmitter being affixed to a surface of said closed cavity, a cylindrical spring affixed to said piezoelectric transmitter opposite said surface, an elongate mass having an axis collinear with said second axis and affixed to said cylindrical spring opposite said piezoelectric transmitter, an accelerometer fixedly coupled to said elongate mass, and an amplifier responsive to said accelerometer for driving said piezoelectric transmitter.
Claim 3
Dependent Claim
59 words
Apparatus as described in claim 1 wherein said amplifier includes: a preamplifier responsive to said accelerometer, a band width limiting amplifier responsive to said preamplifier, a feed back circuit for coupling the output of said band width limiting amplifier to an input thereof, and a power amplifier responsive to said band width limiting amplifier for driving said piezoelectric transmitter.
Claim 4
Dependent Claim
29 words
Apparatus as described in claim 2 further including gain control means responsive to said band width limiting amplifier and disposed between said preamplifier and said band width limiting amplifier.
Claim 5
Dependent Claim
28 words
Apparatus as described in claim 3 wherein said band width limiting amplifier includes in series relation: a first integrating amplifier, an inverting amplifier, and a second integrating amplifier.
Claim 6
Dependent Claim
46 words
Apparatus as described in claim 4 wherein said gain control means includes: a rectifier responsive to said first integrating amplifier, a fourth amplifier responsive to said rectifier, and a field effect transmitter disposed between said preamplifier and said first integrator and responsive to said fourth amplifier.
Claim 7
Dependent Claim
64 words
Apparatus as described in claim 1 wherein said amplifier includes: a preamplifier responsive to said accelerometer, a phase detector having first and second inputs, said first input being responsive to said preamplifier, and a current controlled oscillator responsive to said phase detector, said phase detector being additionally responsive to said current controlled oscillator, and said piezoelectric transmitter being responsive to said current controlled oscillator.
Claim 8
Dependent Claim
30 words
Apparatus as described in claim 6 further including means interposed in series between said preamplifier and said phase detector for selectively adjusting the phase of the output of said preamplifier.
Claim 9
Dependent Claim
20 words
Apparatus as described in claim 7 further including a filter interposed between said phase detector and said current controlled oscillator.
References Cited (Backward Citations)
US2858108A
Cited
US3900827A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |