PACKER Russian patent published in 2007 - IPC E21B33/12 

FIELD: oil production, particularly for temporary well bore plugging during isolation work performing.

SUBSTANCE: packer comprises mandrel 2 with cap 1. Bush 5 with outer annular extension 6 is installed at lower mandrel part so that the bush may perform longitudinal movement. Radial orifices 26 are formed downstream of the bush 5. Through slots 4 are made upstream of the bush in annular depression 3 of mandrel 4. Bush 5 top is connected with cone 7 located under sealing member 8 secured to the bush 5 by means of upper stop 9. Annular extension in lower part of the bush 5 is made as additional cone 10. Sealing member 11 retained against bush with lower stop 12 is arranged below the additional cone 10. The lower stop 12 is provided with locking mechanism 13 located in lower part thereof. Sealing members 8, 11 are made as self-sealed differently directed collars. Cup 14 is installed between cones 7, 10 and secured to finger so that the cup 14 may perform longitudinal and rotational movement. Slips 16, 17 are installed on cup 14 top and bottom. The slips 16, 17 are provided with centrators, which may cooperate with cones 7, 10. Figured slot is created on outer bush 5 surface to cooperate with finger 15. Cap 1 is removable and retained from lower mandrel 2 part with shear screw 29. Cap 1 may cooperate with lower stop 12 in air-tight manner and retained at the stop with locking mechanism 12.

EFFECT: possibility to use standard fishing device for packer removal from well along with decreased load applied thereto during packer breakdown.

2 cl, 2 dwg