... dynamics reach fracture closure pore pressure closure mechanism barree fracture red curve numerical inversion minimum stress interpretation dfit numerical inversion derivative curve dfit interpretation technique bottom hole pressure permeability estimate blue curve injection permeability...

... barrier valve that can be used as a lubricator valve and has a unique closure mechanism that allows it to seal pressures of 10,000 psi and potentially higher, from both above and below. It is operated hydraulically from the surface via dual control lines with one port used to manipulate the valve...