Pressure monitoring system with isolating means

Details Pressure monitoring system with isolating means Pressure monitoring system with isolating means

1989-07-25

1990-02-13

Tudor, Harold J.

Communications: electrical

Wellbore telemetering or control

In horizontal or inclined passage arrangement

166 664, 417 63, 34087016, 340853, G01V 100

Patent

active

049010700

ABSTRACT:
An electric submersible pump system has a pressure monitoring device for monitoring the pressure down the hole. The pressure monitoring device has a pressure transducer whose resistance varies with the pressure. The pressure transducer is connected to ground and is supplied with a DC current that is superimposed on the AC power cable. A temperature switch is connected between the pressure transducer and the motor winding. The temperature switch is normally open, and closes when it reaches a selected temperature. The temperature is selected to be above the ambient temperature in the well and below the temperature that occurs when the motor is operating and fully warmed up. The temperature switch isolates the windings from ground when the motor is shut off and cooled down. This enables the motor winding and power cable to be checked for insulation resistance.

REFERENCES:
patent: 3284669 (1966-11-01), Boyd
patent: 4157535 (1979-06-01), Balkanli
patent: 4178579 (1979-12-01), McGibbeny et al.
patent: 4477230 (1984-10-01), Knox et al.
patent: 4523194 (1985-06-01), Hyde
patent: 4581613 (1986-04-01), Ward et al.
patent: 4631535 (1986-12-01), Butlin
patent: 4803483 (1989-02-01), Vandervier et al.

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