AUTONOMOUS HYDRAULIC PACKER Russian patent published in 2023 - IPC E21B33/1295 

FIELD: oil and gas.

SUBSTANCE: invention and can be used to isolate the intervals of the casing string (annulus) during the development and operation of oil, gas and gas condensate wells. The autonomous hydraulic packer comprises a rod, a connecting sleeve installed in the upper part of the rod, upper and lower sealing elements between which an anchor is installed, consisting of upper and lower cones connected to the casing and spring-loaded rams, a bushing connected to the anchor through the lower cone using shear elements, a piston tightly installed in the housing. The housing is securely and tightly mounted on the rod and forms a chamber with the piston, which communicates with the internal cavity of the rod through the side holes. The sleeve connected to the anchor through the lower cone by means of shear elements is connected from below to the piston, which is configured to move upwards when liquid is supplied under pressure to the internal cavity of the rod and force is transmitted to the collet of the lower load regulator assembly. The upper and lower assemblies of the load regulator are configured for successive transfer of force to the sealing elements and the anchor during the packer installation. Each assembly consists of a bushing with gear grooves made along the outer diameter of the bushing and a collet. In the lower node of the load regulator, the bushing interacting with the collet installed inside the piston is securely fixed on the rod, and in the upper node of the load regulator, the bushing interacting with the collet fixedly mounted on the rod is connected to the lower cone.

EFFECT: increased reliability of packer installation in the well by ensuring consistent transmission of force when the packer is installed first on the upper sealing element, then on the anchor, and only then on the lower sealing element, eliminating compression of the lower sealing element before the anchor is installed, which prevents the loss of compressive force on the upper sealing element and the anchor, as well as making it possible to re-install the packer for process operations in another interval of the well per single trip.

1 cl, 1 dwg