Cutting unit of a hydromecanical slot perforator

摘要

The proposed hydro-mechanical slot-type perforator enables simultaneously performing at least two slots in a production column. The perforator includes a casing, upper and lower pistons movable within the casing, a cutting unit driven by the pistons and carrying extendable cutting tools, and, optionally, a retractable mechanism fixing the perforator for transportation. The extension is provided by rotatable shackles, or balance beams, or a combination thereof. The lower piston is moved by pressurized fluid supplied through hydraulic channels or a hydraulic system, made in the casing. The shackles rotate around axles being spaced apart, or coincided. The cutting tools can be mounted on the shackles' movable parts, and, when mutually interacted, oppositely extend the cutting tools during countermovement of the pistons. The cutting tools can be mounted in the balance beam's shoulders, or can represent sharp edges thereof. The shackles and balance beams can have wedge-shaped portions, grooves, and connecting rods.

主权项

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.