PACKER WITH A FOUR-SECTION HYDRAULIC SETTING CHAMBER Russian patent published in 2023 - IPC E21B33/12 

FIELD: oil and gas industry.

SUBSTANCE: devices for selective hydraulic fracturing, repair and insulation works, used in the implementation of underground workover of wells in order to stimulate the flow of hydrocarbons. The packer with a four-section hydraulic setting chamber for hydraulic fracturing contains: three completely identical hydraulic sections, where the hydraulic section consists of an internal clamping piston having four holes for hydraulic communication between the hydraulic chamber, clamping cylinders and tubing, on which the packer lowers with cylinder seal and O-ring; one hydraulic section containing a clamping piston with a seal containing a retaining ring configured to limit the stroke of the clamping cylinders and control the compression of the packer element; clamping cylinder having a hole of a given diameter to ensure the communication of the annulus with the annulus of the tubing string; a seal on the pressure cylinder, configured to seal in the inside of the setting cylinder to ensure a hermetic separation of the two areas with different pressures. Between the tubular space in the tubing string and the annulus, a differential pressure arises, as it grows, an axial force appears, which is transmitted to the clamping cylinder and the outer cylinder and sets them in motion axially along the packer.

EFFECT: ensuring efficient and reliable activation of the packer by increasing the fluid flow through it.

1 cl, 11 dwg, 3 tbl