ADJUSTABLE PUNCH (VERSIONS) Russian patent published in 2010 - IPC E21B29/10 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions refers to gas-and-oil producing industry, particularly to methods and devices for hermetic sealing of a casing pipe in a well. The device comprises upper and lower seats with a number of moulding sectors in-between to perform constrained radial movement, a diaphragm made of an elastic material provided in the moulding sectors and having a cavity filled with an incompressible flexible medium. The moulding sectors can perform constrained movement inside in the radial direction. The cavity of the diaphragm is connected with a self-contained elastic compensator enabling a permanent backup for the medium in the diaphragm directly or through a piston mounted over a diaphragm. The self-contained elastic compensator can be represented with a compressed gas tank connected with the cavity of the diaphragm. Said incompressible fluid medium in the diaphragm can be an elastic material, and the self-contained elastic compensator can be designed as said compressed gas tank connected with a piston supported by the elastic flexible material. According to the second version, the compensator is provided to maintain the permanent backup for the medium in the diaphragm.

EFFECT: simplified technology, extended application.

21 cl, 12 dwg