Patents Assigned to Chalkbus, Inc.
  • Drilling method
    Patent number: 5010966
    Abstract: A method of receiving returns from a well being drilled in which the hydrostatic pressure of the drilling fluid cannot contain the formation pressure and controlling the flow and pressure of the returns and separating the oil, gas, and drilling fluids on the surface and returning the drilling fluids to the well while disposing of the oil and gas.
    Type: Grant
    Filed: April 16, 1990
    Date of Patent: April 30, 1991
    Assignee: Chalkbus, Inc.
    Inventors: Charles O. Stokley, Richard C. Haas