PACKER FOR SHUTTING OFF INTERNAL CAVITY OF FLOW STRING Russian patent published in 2009 - IPC E21B33/12 

FIELD: oil and gas production.

SUBSTANCE: invention refers to oil production, particularly to repair and operation of oil and gas wells. The packer for shutting off internal cavity of flow string consists of a case with the central channel and upper and lower stops with a sealing component fixed in between; the sealing component has one thickened and one thin-wall inserted-joint parts; the latter forms a cavity with an external wall of the case communicating with outer space of the facility; also a self-sealing collar is made on external surface of the sealing component. The central channel of the case from below is equipped with a back valve with a saddle secured in the case with a shear screw. The self-sealing collar is designed to let flow up-down, while the cavity communicates with external space via the lower stop; also from above the case is equipped with a hollow branch with a piston, outside of which there is located a cylinder with a collet below, communicated with internal cavity of the sleeve and designed to a restricted motion upwards. Internal surface of the collet is of a cone shape narrowing downward; it interacts with the piston, while external surface is equipped with lugs designed to interact with internal surface of flow string.

EFFECT: reliable operation under high pressure due to more fail-safe insulation of annular space.

1 dwg