HYDRAULIC PACKER Russian patent published in 2015 - IPC E21B33/12 

FIELD: oil and gas industry.

SUBSTANCE: intended for disconnection of the well casing string between the submerged pump and equipment for produced fluid separation from mechanical admixtures, and can be also used during development and operation of the oil and gas wells. The hydraulic packer contains stock with thread ends, installed on stock sealing assembly containing stop, movable sleeve and installed between them sealing element, and hydraulic drive containing a hydraulic cylinder and valves system. At that end part of the spring-loaded piston of the hydraulic cylinder is located in the internal boring of the movable sleeve. On the hydraulic cylinder lid a ball check valve and differential valve are installed, they are hydraulically connected with each other by the common chamber connected with output of the submerged pump. At that the differential valve is provided with radial channel, that during shutdown of the submerged pump connects the above piston cavity of the hydraulic cylinder with annulus.

EFFECT: improved design of the hydraulic packer, improved comfort o maintenance.

2 cl, 4 dwg