Patent ID: 9303494
Filing Date: 2016-04-05
CPC Classification: E21B

Claim Text:
1. A hydro-mechanical slot-type perforator comprising: a casing; an upper piston movable within the casing; a lower piston movable within the casing; a cutting unit located below the upper piston and above the lower piston; said cutting unit includes: cutting tools, and an extension mechanism for extending and retracting said cutting tools; said extension mechanism includes: an upper shackle having an upper movable part, and a lower shackle having a lower movable part; wherein: said cutting tools are mounted on the upper movable part and on the lower movable part; said upper shackle is configured to rotate around an axle during a downward stroke of said upper piston enabling the upper piston to act upon the upper shackle; said lower shackle is configured to rotate around an axle during an upward stroke of said lower piston enabling the lower piston to act upon the lower shackle; and the lower piston is moved by pressurized fluid supplied thereto through at least one hydraulic channel made in the casing, or through a hydraulic system.