HYDRO-MECHANICAL PACKER Russian patent published in 2018 - IPC E21B33/12 

FIELD: machine building.

SUBSTANCE: invention relates to the packers. Hydromechanical packer contains a shaft with a radial bore, by the adapter connected to the tubing string, a hydraulic cylinder with a piston. On the shaft are installed: supporting anchor, including locking dies and unclenching them cone, compressible annular cuffs with possibility of radial expansion to the well annular cavity sealed separation, sliding centralizer, comprising a housing with expanding friction dies with possibility of its fixing on the packer shaft with the packer lowering into the well, a saddle with a ball valve, located at the shaft bottom. Outside the shaft below the centralizer housing, with the locking dies and the anchor cone open position, the centralizer hydromechanical hook is installed. Hook contains a hydraulic cylinder with a piston, the latter for the packer lowering into the well is fixed with shear pins in the hydraulic cylinder, which communicates with the shaft cavity through the axial channel in the hydraulic cylinder base and the radial channel in the packer shaft wall through the connecting them nipple. On the piston an elastic hook is mounted, holding the sliding centralizer during the packer lowering into the well by the housing inner collar, made with a gap relative to the shaft for the hook movement, for which in the hydraulic cylinder upper end a groove with a protrusion for the hook accommodation is made. On the hook a cam is made, which brings the elastic hook out of engagement with the centralizer housing collar.

EFFECT: technical result is increase in the packer fixing reliability and the well cavity separation tightness.

3 cl, 4 dwg