Downhole power and communication system

Details Downhole power and communication system Downhole power and communication system

1995-10-17

1999-11-30

Eldred, J. Woodrow

Communications: electrical

Wellbore telemetering or control

Using a specific transmission medium

3408553, 3408554, 3408558, 175 40, 16625001, H01V 300

Patent

active

059950200

ABSTRACT:
An apparatus for transmitting electricity between downhole well tools and the well surface. The apparatus incorporates a surface controller in combination with a conductor and a downhole receiver module. A choke prevents electricity from the controller from entering a high voltage DC power source, and a downhole regulator converts high voltage, low current power into high current, low voltage power. This feature of the invention permits a single wire to transmit sufficient power to operate multiple downhole well tools. The controller also includes a transmitter and a modulator operable to generate an electric signal representating at least two states, wherein a first state is represented by a signal, and wherein a second state is represented by the absence of an electric signal. A receiver module receives the electric signals and selectively transmits commands to the associated well tool or to the surface controller. In a two conductor wire, the conductors are evenly spaced so that attenuation of the signals is reduced. The controller can transmit a signal unique to a well tool which is selectively identified by the receiver module for operation of a specific well tool.

REFERENCES:
patent: 4689620 (1987-08-01), Wondrak
patent: 4995058 (1991-02-01), Byers et al.
patent: 5515038 (1996-05-01), Smith
patent: 5515039 (1996-05-01), Delattore
patent: 5539375 (1996-07-01), Atherton

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