Borehole acoustic telemetry system

Details Borehole acoustic telemetry system Borehole acoustic telemetry system

1979-08-10

1981-10-06

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through drill string or casing

367901, 330132, 333173, G01V 140

Patent

active

042939372

ABSTRACT:
In a borehole acoustic telemetry system for acoustically transmitting data over a pipe suspended in a borehole, the level of noise in the data stream is inherently high, making the use of precise frequencies advantageous to provide useful data. A first transmitter in the system operates at a precise frequency to transmit a signal over the pipe where it is received by a receive and retransmit circuit path. Components in the receive and retransmit section filter and amplify a data component of the signal and retransmit the data signal at a precise frequency. Crystal controlled oscillator clocks are operated in the system at a same frequency in the transmitter and receiver-retransmitter to insure precise frequency control of the system.

REFERENCES:
patent: 3205477 (1965-09-01), Kalbfell
patent: 3293607 (1966-12-01), Kalbfell
patent: 3614724 (1971-10-01), Brown et al.
patent: 3714622 (1973-01-01), Wilhelmser
patent: 3795877 (1974-03-01), Poole
patent: 3944723 (1976-03-01), Fong
patent: 3944932 (1976-03-01), Fong
patent: 3978422 (1976-08-01), Rheinfelder
patent: 4017812 (1977-04-01), Claudet et al.
patent: 4019148 (1977-04-01), Shawhan
patent: 4101849 (1978-07-01), Blackmer

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