Patents Assigned to Dailey Petroleum Corp.
  • Converted dual-acting hydraulic drilling jar
    Patent number: 5984028
    Abstract: A jar up, bump down hydraulic drilling jar is described. A hydraulic tripping valve arrangement permits the storage of large amounts of static force before releasing a hammer to strike an anvil surface with substantial force. The hammer is positioned on the mandrel and interacts with the anvil surface in the housing to deliver upward jarring forces, to the drill string. During a downward jarring movement, the tripping valve is opened to prevent pressure buildup and accidental downward jarring; thus, a single-acting drilling jar is formed.
    Type: Grant
    Filed: July 15, 1997
    Date of Patent: November 16, 1999
    Assignee: Dailey Petroleum Corp.
    Inventor: Timothy L. Wilson