Downhole telemetry apparatus and method

Details Downhole telemetry apparatus and method Downhole telemetry apparatus and method

1983-07-01

1987-09-01

Cangialosi, Salvatore

Communications: electrical

Wellbore telemetering or control

In horizontal or inclined passage arrangement

367 81, 324369, 340854, G01V 140

Patent

active

046912037

ABSTRACT:
A system and method is described for amplifying and transmitting an information signal from a downhole drillstring location. The amplifier shifts the relatively low frequency information signal up to a high frequency level, amplifies the high frequency signal and processes it through an impedance matching transformer, and then demodulates the amplified signal back to the original low frequency for transmission through the earth to the surface, thus enabling the use of a much smaller transformer than when the information signal is processed entirely at the low frequency level. A novel transducer consisting of generally cylindrical conductive sleeves separated by an insulative gap is used to provide structural integrity and to transmit the amplified information signal. The conductive sleeves are heat shrunk onto an insulative sleeve and a central mandrel.

REFERENCES:
patent: 2379800 (1945-07-01), Hare
patent: 3906435 (1973-09-01), Lamel et al.
patent: 3945704 (1976-03-01), Kraus et al.
patent: 4087781 (1978-05-01), Grossi et al.
patent: 4348672 (1982-09-01), Givler
patent: 4496174 (1985-01-01), McDonald et al.
McDonald et al., "Borehole Telemetry System . . . " Oil and Gas Journal, 9/15/75, pp. 111-118.

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