Resources Contact Us Home
Controller for oil wells with a thermal dispersion probe

Image Number 8 for United States Patent #5525040.

A controller for controlling the pumping unit for an oil well comprises a housing having a first and a second tip for placement in a flow of oil between the wellbore to holding tanks; means for generating a substantially constant power; a constant power heater in the first tip connected to the means for generating, for radiating a substantially constant heat; means for determining the temperature at each the first and second tips and for generating a digital signal indicative of the temperature of the first and second tips; supervising means for controlling the means for determining, processing the digital signal for determining a rolling average signal, and generating a control signal therefrom which is independent of ambient temperature of the oil flow; and means for switching the pumping unit on or off, according to the control signal. The controller further comprises means for calibrating the means for determining. The constant power heater is preferably a FET connected in series with a resistor. The invention also provides a optimizing method for controlling a pumping unit of an oil well.

  Recently Added Patents
Semiconductor memory device, test circuit, and test operation method thereof
Composite conductive pads/plugs for surface-applied nerve-muscle electrical stimulation
Method and apparatus for user selection of advertising combinations
Semiconductor element-embedded wiring substrate
Analog to digital converter with increased sub-range resolution
Linerless labels
System and method for detecting crop rows in an agricultural field
  Randomly Featured Patents
Switching power supply unit
Apparatus for cutting columnar structures with reciprocally movable tensioned cutting wire
Inhibition of selectin binding
Power supply system
Method of manufacturing semiconductor device
Thiazolidinedione derivatives or salts thereof and pharmaceutical compositions containing the same
Compressed natural gas barge
Event decomposition using rule-based directives and computed keys
Process for the reduction of ammonia in regeneration zone off gas by select addition of NO.sub.x to the regeneration zone or to the regeneration zone off gas