Patent ID: 7891434
Filing Date: 2011-02-22
Classification: E21B

Abstract:
1. A method of actuating a well tool within a wellbore having an annulus, the method comprising the steps of: operably associating a well tool actuator with a downhole well tool, the well tool actuator having a setting member with movement responsive to hydrostatic pressure; flowing wellbore fluid from the annulus into the well tool actuator under hydrostatic pressure; opening a flow restrictive path within the well tool actuator; flowing a substantially incompressible fluid into a compressible fluid chamber within the well tool actuator along the flow restrictive path under impetus of the wellbore fluid; and wherein flowing the substantially incompressible fluid into the compressible fluid chamber causes the setting member to move and actuate the well tool by draining the substantially incompressible fluid from a drain chamber within the well tool actuator to create a suction force within the drain chamber, the suction force causing the setting member to move.