Power control system for subsurface formation testing apparatus

Details Power control system for subsurface formation testing apparatus Power control system for subsurface formation testing apparatus

1986-01-10

1988-01-26

Levy, Stewart J.

Measuring and testing

Borehole or drilling

Downhole test

73151, E21B 4900

Patent

active

047209968

ABSTRACT:
Apparatus for collecting a plurality of samples of fluids in earth formations traversed by a wellbore includes control circuits for supplying power control signals to the subsurface instrument. The control circuits include circuitry for establishing electrical connection to the hydraulic power system of the instrument and after a preselected period of delay supplying power signals to a hydraulic pump motor and/or solenoid valve controls therein. Current is monitored by over-current protection circuitry. In the instance of a current overload, power signals are removed from the hydraulic power system and after a preselected period of delay the control circuits are disconnected from the instrument.

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