PACKER Russian patent published in 2007 - IPC E21B33/12 

FIELD: oil and gas industry, particularly devices for hermetical reservoir isolation.

SUBSTANCE: packer comprises body with central channel and connection pipe provided with shaped slot on outer surface thereof. Packer also has conical depression adjoining connection pipe, movable bush supported by connection pipe and having finger cooperating with shaped slot, as well as spring-loaded centralizer. Slips cooperating with conical depression are connected to spring-loaded centralizer ends. Packer includes upper and lower self-sealing sleeves, check valve, seating tool rigidly connected to tubing string and to body through shear members, hollow sealed rod. The hollow sealed rod comprises radial channels and lower end telescopically sliding inside central body channel. Seating tool is made as connection pipe and has rest on inner surface. Connection pipe interior communicates with ambient space. Hollow rod is closed over radial channels and provided with annular depressions. One annular depression is arranged in lower part, other two ones are located over radial channels. Sealing means is installed in upper depression. Upper and lower springing collars are installed in other two annular depressions. Conical depression of the body is made as upper and lower cones and connection pipe is arranged in-between. Opposite upper self-sealed sleeve and lower sleeve are located over upper cone and under lower cone correspondingly. Centralizer includes upper and lower centering members provided with differently-directed slips. Central channel of the body over self-sealed collar has restriction, which receives hollow rod so that the rod may perform limited axial movement. Radial channels of hollow rod may be communicated with central channel over restriction as hollow rod slides upwards. Upper spring-loaded ring is adapted for adjustable hollow rod fixation as hollow rod slides downwards.

EFFECT: increased simplicity, reliability and manufacturability.

4 cl, 2 dwg