RETRIEVABLE BRIDGE PLUG Russian patent published in 2018 - IPC E21B33/12 

FIELD: construction.

SUBSTANCE: invention relates to retrievable bridge plugs. Technical result is the creation of a self-sealing effect of the bridge plug. Retrievable bridge plug includes a barrel, a sealing element, the locking element of the sealing element, the main and additional cones with which spring-loaded grippers are connected, a detachable unit, a hydraulic cylinder with a piston connected to the pipe string. Piston of the hydraulic cylinder is telescopically connected to the barrel and rigidly to the main cone. Hydraulic cylinder is installed between the anchor unit and the sealing element in the bridge plug with the possibility of the cylinder acting on the sealing element. Piston is connected to the cylinder by a locking ring with a notch that keeps it from the return stroke inside the cylinder. Cavity of the hydraulic cylinder is connected with the inner hole in the trunk.

EFFECT: hole is communicated through the adapter with a string of pipes.

1 cl, 2 dwg