DEVICE FOR CEMENTING TAIL IN WELL Russian patent published in 2007 - IPC E21B33/14 

FIELD: oil extractive industry.

SUBSTANCE: device includes tail with tubing column lowered into it, disconnector provided with external left thread for connection through sleeve to upper end of tail, shoe with through channel and sleeve. In accordance to invention device is equipped with packing unit, consisting of body with cylindrical elastic collar pinned on it with circular external and internal grooves, abutting from below on rigidly mounted bushing and contacting from above the moveable bushing, interacting with protective bushing, between ends of which spring stopping ring with cuts is positioned, while on the body oppositely directed cuts are made for these. Protective bushing is provided with shear screws positioned in longitudinal grooves of body, connected by other ends of lesser diameter to controlling bushing mounted inside the body, connected to it by shear elements and made with cylindrical recess on end part on internal side of it. Upper part of body is provided with radial channels, closed on outside by elastic sleeve valve, rigidly held in lower part. On ends body is connected to sleeves with packing rings inside and plated localizers outside. Upper sleeve is connected to tail, while lower one, made with circular shelf inside, is connected to perforated portion of tail, and the latter is connected to shoe, between ends of which packing bushing is mounted. Tubing column with head on the end in middle part is provided with potting unit, consisting of branch pipe with cylindrical recess outside, mounted in which are spring stopping ring and a set of collars, loaded from above by potting body with radial channels, in original position closed by moving valve in form of barrel, connected to potting body by shear elements and provided with elastic ring projecting towards inside. Upper part of tubing column is connected to sub having connectors on external surface, mounted inside the disconnector, having recesses for connectors, positioned above which on sub is stopping bushing, connected to the latter by means of shear screws.

EFFECT: simplified construction and expanded functional capabilities of device.

4 cl, 1 dwg