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

FIELD: oil industry, in particular, construction and maintenance of wells.

SUBSTANCE: device includes telescopically positioned internal and external bodies, saddle with valve. In lower part of external body windows are made. In accordance to invention internal body is made hollow, is provided with slots and a valve mounted on external surface in form of a plug above the saddle. Saddle is held on internal surface of external body by destructible element and is equipped with fingers. Valve and saddle are made with possible interaction in working position. External body, on external surface of which axial grooves are made for fingers of saddle, is provided additionally above windows with packer in form of elastic sleeve, fixed in lower part relatively to external body and reinforced from inside with shell, cone connected to fingers of saddle and made with possible fastening relatively to external body and expansion of packer in working position. External body from above is connected by left thread to a sub. On internal surface of aforementioned sub grooves are made underneath. In source position internal body is connected to sub via locking mechanism. Slots of internal body are mated with grooves of sub.

EFFECT: simplified construction of device and increased reliability of its operation.

2 cl, 1 dwg