Patents Assigned to Oil Well Automation, Inc.
  • Level sensor
    Patent number: 4747451
    Abstract: A system for controlling production in an oil well comprises a first level sensor mounted upon the outer surface of the tubing near the lower end of the tubing and a second level sensor mounted upon the outer surface of the tubing above the first level sensor. The first level sensor is tuned to a first electrical signal frequency. The second level sensor is tuned to a second electrical signal frequency. A control device at spaced intervals transmits electrical signals of the first and second frequencies down the oil well and senses the liquid level by detecting impedance.
    Type: Grant
    Filed: August 6, 1987
    Date of Patent: May 31, 1988
    Assignee: Oil Well Automation, Inc.
    Inventors: Harold P. Adams, Jr., David R. Hill, Lee M. Richey, Andrew B. Maitland, William E. Banton, David C. Taylor
  • Level sensor
    Patent number: RE33690
    Abstract: A system for controlling production in an oil well comprises a first level sensor mounted upon the outer surface of the tubing near the lower end of the tubing and a second level sensor mounted upon the outer surface of the tubing above the first level sensor. The first level sensor is tuned to a first electrical signal frequency. The second level sensor is tuned to a second electrical signal frequency. A control device at spaced intervals transmits electrical signals of the first and second frequencies down the oil well and senses the liquid level by detecting impedance.
    Type: Grant
    Filed: April 5, 1990
    Date of Patent: September 17, 1991
    Assignee: Oil Well Automation, Inc.
    Inventors: Harold P. Adams, Jr., Andrew B. Maitland, David R. Hill, William E. Banton, Lee M. Richey, David C. Taylor