Patent ID: 7681652

Claim:
A setting device for actuating a wellbore tool within a wellbore, the device comprising: an interior mandrel defining a central flowbore; a setting member for contacting an actuatable portion of a wellbore tool, the setting member being moveable between a first position, wherein the actuatable portion of the tool is actuated; a compressible fluid chamber defined within the setting device radially outside of the interior mandrel and containing a compressible fluid, the compressible fluid chamber comprising a plurality of axial blind bores formed within a housing surrounding the interior mandrel; an incompressible fluid chamber defined within the setting device radially outside of the interior mandrel and containing a substantially incompressible fluid at a higher pressure than the compressible fluid; a trigger device to selectively flood the compressible fluid chamber with the substantially incompressible fluid; and wherein the setting member is moved from the first position to the second position upon flooding of the compressible fluid chamber with the incompressible fluid from the incompressible fluid chamber.