DEVICE FOR CEMENTING A TAIL IN A WELL Russian patent published in 2006 - IPC E21B33/14 

FIELD: oil extractive industry.

SUBSTANCE: device includes a tail with tubing column lowered therein, disconnector in form of a sub connected by upper section to lifting pipes, and by lower section to tubing pipes, also provided with external leftward thread for connection through sleeve to upper end of tail and a shoe with through channel and a sleeve. In accordance to invention device is provided with packing assembly consisting of body, upper supporting bushing rigidly mounted thereon, cylindrical elastic collar with circular external and internal grooves, abutting against moveable internal bushing below, between end of which bushing and moveable external bushing below a spring stopping ring with cuts is mounted, and matching cuts of opposite direction are made on the body. Moveable external bushing is provided with shear screws positioned in longitudinal grooves of body and connected by other ends of lesser diameter to controlling bushing, mounted inside the body and connected thereto by shear elements. Body of packing assembly by its lower section is connected to filling sleeve provided with radial channels, which sleeve is in turn connected to perforated section of tail piece, and the latter is connected to the shoe. Tubing column via stepped sub is connected to nipple in form of branch pipe with radial channels in middle section, closed by saddle in starting position. Branch pipe is provided with packing elements below and above the radial channels, spring-loaded with nuts. Nipple in lower section is connected to end piece. In the sleeve connecting aforementioned shoe to perforated section of tail, supporting bushing is mounted with central through channel with a tail piece let through it, provided with shear screws, which by sections of lesser diameters are connected to lower press nut of nipple.

EFFECT: simplified construction, expanded functional capabilities of device.

3 cl, 1 dwg