Apparatus and method for controlling the speed of a pump in a well
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United States of America Patent
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Jul 27, 2010
Grant Date -
Sep 14, 2006
app pub date -
May 15, 2006
filing date -
May 5, 1997
priority date (Note) -
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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 includes 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 the pump control signal continuously varies a predetermined parameter for controlling the flow rate of a pumping unit during operation of the pumping unit.
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