Communications: electrical – Wellbore telemetering or control – In horizontal or inclined passage arrangement
Patent
1984-04-26
1987-02-24
Jordan, Charles T.
Communications: electrical
Wellbore telemetering or control
In horizontal or inclined passage arrangement
340857, 340859, G01V 140
Patent
active
046460837
ABSTRACT:
A measuring and telemetry system is disclosed adapted to measure the ambient pressure and temperature in a downhole environment, and to telemeter signals representative of such measurements to the wellhead for demodulation and display. Only two wires are used in the system between the wellhead and the measuring location downhole. The two wires are used for both the power applied downhole and measurement signals transmitted uphole. A current balance circuit is provided for a downhole iron core transformer through which the DC power is provided through one winding. The current balance circuit senses a signal representative of the DC current flowing through the one winding and applies an equal in magnitude but opposite in direction current through the other winding of the transformer to prevent magnetic saturation of the transformer.
Multiplexing circuits are provided downhole for generating a multiplexed signal of two sine waves the frequency of each being representative of the pressure signal or the temperature signal. Such multiplexed signal is applied to the first winding of the downhole transformer for inductive coupling to the second winding and to the electrical leads for transmission uphole. Uphole circuits are provided for demultiplexing and displaying signals representative of the downhole pressure and temperature.
This abstract of the disclosure is neither intended to define the scope of the inventions, which is measured by the claims, nor is it intended to limit the invention in any way.
REFERENCES:
patent: 2573137 (1951-10-01), Greer
patent: 2968738 (1961-01-01), Pintell
patent: 3182286 (1965-05-01), Zimmerman et al.
patent: 3732728 (1973-05-01), Fitzpatrick
patent: 3982189 (1976-09-01), Brooks et al.
patent: 4093936 (1978-06-01), Eberline et al.
Eldred John W.
Hydril Company
Jordan Charles T.
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