Patent ID: 8215400

Claim:
A system for opening a window in a casing string positioned in a wellbore, the system comprising: a hydraulic pressure intensifier having a housing and a piston assembly with a differential piston area, the piston assembly longitudinally shiftable relative to the housing, the piston assembly initially secured relative to the housing to prevent longitudinal movement therebetween; an anchor assembly operably associated with the hydraulic pressure intensifier, the anchor assembly operable to longitudinally secure the hydraulic pressure intensifier within the casing string; and a window opening tool operably associated with the hydraulic pressure intensifier and operably engagable with the casing string such that when the anchor assembly is longitudinally secured within the casing string and the piston assembly is unsecured relative to the housing under hydrostatic pressure in the wellbore, longitudinal movement of the piston assembly transmits a force to the window opening tool, thereby opening the window in the casing string.