Parameter telemetering from the bottom of a deep borehole
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United States of America Patent
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Nov 29, 1988
Issued Date -
N/A
app pub date -
May 27, 1986
filing date -
Aug 15, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus for measuring one or more parameters of the subsurface environment, and telemetering one or more parameters of the subsurface environment to the surface. Apparatus at the surface includes a source of intermediate frequency and voltage, electrical energy for transmission down one or more conductors of a power cable or separate instrument wire to a downhole instrument package. This intermediate frequency voltage is converted to a power supply voltage for generating a high frequency FM signal, in accordance with the magnitude of one or more parameters of the environment. This frequency modulated signal is sent to the surface over the conductors of the power cable and ground. At the surface the signal is demodulated to produce a signal indicative of the transmitted parameter.
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