HYDROMECHANICAL PIERCING PERFORATOR AND ITS OPERATING PRINCIPLE Russian patent published in 2014 - IPC E21B43/112 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to drilling and operation of wells, in particular to design of devices for completion of producing strata by piercing perforation. Hydromechanical piercing perforator contains housing and the following components in the housing: at least one hydraulic cylinder, at least one V-shaped pusher, at least one operating tool equipped with at least one end-to-end hydraulic channel and at least one mud jet gun installed so that it can interact with V-shaped pusher and move radially. According to the invention operating tool is made as a puncher located at piston or plunger installed in a chamber; the chamber has hydraulic communication with hydraulic cylinder. Operating principle of the perforator includes delivery of operating fluid to it through tubing string, generation of operating pressure to activate retraction mechanism of the operating tool, retraction of the operating tool and performance of perforation; at that retraction of the operating tool is made by action of operating fluid pressure through rod-piston system to V-shaped pusher and by V-shaped pusher to tool piston or plunger with puncher and under influence exercised to tool piston/ plunger of operating fluid fed under pressure through hydraulic cylinder of the perforator to the operating chamber of tool piston/plunger.

EFFECT: providing high-jetting cleanout for bottom-hole zone right after strata completion, increasing punching force of the perforator, improving its reliability, reducing breakdown rate.

8 cl, 14 dwg