DEVICE FOR SEPARATION OF INDIVIDUAL SECTIONS OF WELL SHAFT Russian patent published in 2016 - IPC E21B33/12 

FIELD: mining.

SUBSTANCE: invention relates to devices for separation of individual sections of well bore. Device for separation of individual sections of well bore includes a pipe string, a sealing element of cylindrical shape, arranged concentrically to pipe string and casing pipe. Sealing element is made of three parts: upper part made from material with relatively low coefficient of thermal expansion, middle part made from metal rubber, and lower part, having a relatively high coefficient of thermal expansion. All parts without axial clearance are installed between the upper support, rigidly connected to the pipe string, and a piston installed under sealing element. At end of lower pipe string there is support nozzle-coupling. Upper part of sealing element is made from filled fluoroplastic, lower part of sealing element is made from basalt fibre with diameter from 0.5 to 3.5 mcm, basalt fibre saturated with metal particles. Aluminium powder is used as metal for saturation.

EFFECT: enabling operation at high pressure and high temperature.

7 cl, 2 dwg, 1 tbl