Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent
1987-07-15
1989-01-17
Novosad, Stephen J.
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
166 664, 166332, 2511292, E21B 3406
Patent
active
047982470
ABSTRACT:
A power supply and control arrangement for a submersible pump and solenoid operated safety valve system. A surface control unit is connected to a downhole control unit by a three conductor cable. A single phase 400 Hz signal from the surface unit is rectified downhole and operates the solenoid to open the safety valve but is too high a frequency to affect the pump motor. A downhole detector senses full open condition of the safety valve and sends a signal to the surface where it is received by a monitor. The monitor interrupts the 400 Hz signal and applies a three phase 60 Hz signal to all three conductors of the cable to operate the pump motor and be rectified downhole to hold the solenoid and safety valve open. Loss of the valve open signal by the monitor interrupts the 60 Hz signal and disables the system until it is reset.
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Deaton Thomas M.
Perkins Donald H.
Melius Terry Lee
Novosad Stephen J.
Otis Engineering Corporation
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