Patents Assigned to Donovan Brothers Incorporated
  • Drilling nipple gas trap
    Patent number: 5007488
    Abstract: The present invention is a gas sampling device. A gas sampling tube and pump withdraw gas which evolves into the atmosphere as the drilling fluid in the annular space exits the wall bore. Drilling fluid and debris which may be entrained in the gas sample are separated by gravity settling in a separation device. A purge line may be used to agitate drilling mud and force gas toward the gas sampling tube.
    Type: Grant
    Filed: May 16, 1990
    Date of Patent: April 16, 1991
    Assignee: Donovan Brothers Incorporated
    Inventor: William S. Donovan