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

FIELD: oil production industry, particularly well construction and repair.

SUBSTANCE: device comprises upper and lower bodies. Lower body has orifices and packing member installed between stops. Check valve with seat and valve stem with orifice is arranged inside the bodies. Valve stem is joined to pipe string. Device also has fastening unit, fixers and anchoring unit. Check valve seat and stem are spaced apart and coaxially arranged in the bodies. Lower body orifices are closed with collar. Longitudinal slots are created in tubular body walls. Hollow cup provided with shear fingers is arranged in lower body surface so that the hollow cup is fixed with breakable member. The hollow cup is connected with upper rest. Packing member is made as elastic sleeve fixed with rest from below and reinforced with shell. The shell cooperates with upper and lower rests. Check valve seat is made as plug, which may hermetically cooperate with hollow cup in working position. Collar is located on check valve stem between the orifices and sub. Anchoring unit is made as bushing with springing centrators and technological grooves. Fastening unit is made as transfer bush. Fastening unit is fastened to upper body.

EFFECT: simplified structure and increased load-bearing capacity.

2 dwg