DEVICE FOR INSTALLATION AND SEALING OF CASING STRING LINER IN WELL Russian patent published in 2013 - IPC E21B43/10 E21B33/16 

FIELD: oil and gas industry.

SUBSTANCE: device for installation and sealing of a casing string liner in the well can be used for reinforcement of vertical and inclined shafts of wells with liners of casing strings and for sealing of casing string annulus of liners. It includes housing (7) and anchors and packers arranged on it, housing (1) and a valve unit and a disconnection unit, which are arranged on it. Valve unit includes piston (8) with spring-loaded switch (9) with shaped slot (10), which is located on the inside, in which pin (11) rigidly fixed on housing (1) is installed. In housing (1) there are radial holes (5) shut off with suspended plug (4), which, when in working position, hydraulically connect the cavity of housing (1) to the cavity formed with effective surface of piston (8) of valve unit, which acts on switch (9) and spring-loaded ring (14) that shuts off radial openings (13) made in housing (1), which, when in working position, hydraulically connect the cavity of housing (1) to the cavity formed with effective surface of piston (25) of anchor and packer assemblies and piston (38) of disconnection unit that presses limit stops (36) installed in funnel (35) of disconnection unit.

EFFECT: improving operating reliability of the device.

3 cl, 3 dwg