HYDRAULIC PACKER Russian patent published in 2014 - IPC E21B33/12 

FIELD: oil and gas industry.

SUBSTANCE: hydraulic packer comprises a mandrel connected to a coupling, O-ring, a cylinder connected at one butt end to a blind by a collar and at the opposite butt end to a push dish-shaped thrust of the O-ring, a circular liquid chamber. The circular liquid chamber is formed by boring the cylinder inner surface and is communicated to the borehole cavity through a channel made in the mandrel wall and to below-packer borehole cavity through via holes made in a wall of the bored cylinder. The push dish-shaped thrust of the O-ring is fixed in the borehole by shear pins temporarily. There is a valve in the blind. A rigid dish-shaped thrust of the O-ring is made at the coupling. There is a piston in the cylinder and this piston is connected to the borehole thus forming a tight-proof gas chamber with the blind. In the cylinder bore there is a locking device, which fixes position of the push dish-shaped thrust in the borehole by the cylinder when the O-ring is compressed.

EFFECT: simplifying design and reducing labour intensity required for packer setting in the borehole.

4 cl, 1 dwg