Controller for oil wells using a heated probe sensor

Details Controller for oil wells using a heated probe sensor Controller for oil wells using a heated probe sensor

2006-05-16

2006-05-16

Lee, Hwa (Andrew) (Department: 2877)

Pumps

Condition responsive control of pump drive motor

Responsive to pump or pump fluid temperature

Reexamination Certificate

active

07044715

ABSTRACT:
A controller for controlling the pump unit of an oil well includes a sensor having a first and second probe for placement in the flow of oil from the well bore. Each of the probes contains a heater. A constant power source is selectively connected to one of the heaters. Each of the probes also include a linear RTD at each of their tips respectively for generating a signal indicative of the temperature measured at each of the first and second probes. A control unit receives signals from the RTD's and determines a flow rate therefrom. A pump control signal is generated in response to the flow rate, wherein pump control signal continuously varies a predetermined parameter of a pumping unit during operation of the pumping unit.

REFERENCES:
patent: 5984641 (1999-11-01), Bevan et al.

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