Patents Assigned to HPI AS
  • Method and device for fluid displacement
    Patent number: 7610963
    Abstract: A method and device for displacement of a first fluid by means of a second fluid in a borehole (1) in the ground, where, during displacement, the second fluid is kept separate from the first fluid, and where the volume of an expandable space (22) in which the second fluid is to be located following the displacement, increases during inflow of the second fluid.
    Type: Grant
    Filed: October 26, 2005
    Date of Patent: November 3, 2009
    Assignee: HPI AS
    Inventors: Tom Unsgaard, Steffen Eversen