Patents Assigned to Operational Devices, Inc.
  • Sonic pump off detector
    Patent number: 4171185
    Abstract: Pump off conditions of an oil well are determined by listening to the sonic clicks of the traveling valve and bottom hole valve. If the clicks do not occur within a certain period after top dead center for successive pump cycles, the well is assumed to be pumped off and is shut down. If, upon being restarted for a successive number of times, the valves do not click within the proper time frame it is assumed that there has been a pump failure and the well is shut down until manually restarted.
    Type: Grant
    Filed: June 19, 1978
    Date of Patent: October 16, 1979
    Assignee: Operational Devices, Inc.
    Inventors: Billy J. Duke, William H. Meister