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 and hollow sealed rod. The hollow sealed rod comprises radial channels and telescopically slides inside central body channel. Seating tool is made as connection pipe and has rest on inner surface. Connection pipe interior communicates with ambient space. 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 has restriction located in lower part thereof and receiving hollow rod so that the rod may perform limited axial movement. The rod is sealed over radial channels. Annular depressions, springing ring and sealing means are serially installed over the radial channels in bottom-top direction. Radial channels may be communicated with central channel over restriction as hollow rod slides upwards. Springing ring is adapted for adjustable hollow rod fixation as hollow rod slides downwards.

EFFECT: increased simplicity, reliability and manufacturability.

3 cl, 2 dwg