METHOD FOR MECHANICAL PERFORATION AND DEVICE FOR ITS REALISATION Russian patent published in 2009 - IPC E21B43/112 

FIELD: oil and gas production.

SUBSTANCE: group of inventions is related to the field of oil and gas production and may be used for perforation in flow strings in oil or gas well. Device comprises vessel 1 with a support protrusion 7 on external surface, which is arranged at the level of instrumental piston 5. It comprises hydraulic booster in the form of piston 2 with stem 3 and chamber 4 underneath, which communicates to above-piston space of instrumental piston 5. Support piston 8 is installed coaxially to instrumental piston 5 with spherical external surface 9. Piercing tool 6 is installed on instrumental piston 5. Body 1 and base of piercing tool 6 are arranged as conical. End surface of piercing element 6 is arranged as conical, or flat, or spherical. In lower part of device there is an oil collector 13, which communicates to chamber 4 of hydraulic booster via throttling opening 14 and space created between instrumental 5 and support 8 pistons, and has piston 15, which interacts with screw 16.

EFFECT: improved efficiency and quality of perforation, improved reliability of perforator.

8 cl, 3 dwg