HYDRAULIC PACKER FOR CUP CEMENTATION Russian patent published in 2011 - IPC E21B33/12 E21B33/14 

FIELD: oil and gas industry.

SUBSTANCE: hydraulic packer for cup cementation contains hydraulic packer and cementing collar, which are connected in one housing. Housing of packer consists of lower and upper parts. Hose is attached to lower part of housing. Packer includes three sleeves: lower, intermediate and upper one. Sleeves inside packer occupy strictly fixed position which is provided with shear screws and/or fasteners and/or locking rings. Lower sleeve includes seat for ball. Upper sleeve includes seat for closing plug. Between outer surface of lower part of housing and inner surface of casing connected in a detachable manner to lower part of housing and adapter there installed is piston of valve unit having cylindrical shape of variable cross-section and capable of interacting by means of its end part with working liquid. End part of piston has two chamfers, external and internal one, as well as channels on that piston surface on which the chamfer has smaller inclination angle of surface relative to end surface of piston. Piston has sealing rings both on outer and inner sides. Valve unit includes spring having rectangular cross section of turn.

EFFECT: reducing material consumption of packer, simplifying its design and improving reliability of its operation by improving the design.

9 dwg