FACILITY FOR SEALING OF CIRCULAR SPACE Russian patent published in 2009 - IPC E21B33/12 

FIELD: oil and gas industry.

SUBSTANCE: facility refers to oil and gas industry. It is designed for disconnection of producing horizons and for sealing of circular space in interval of upper pipes of liner. The facility consists of a shaft with radial channels made in its walls. A piston designed to perform axial displacements is fixed on the shaft by means of a shear screw. Under the piston there is arranged an expanding cone and a seal containing collars resting on a lower sub, the upper end if which is made in form of a circular projection forming a shell, while on external side surface of the sub there are made lugs, which form centralisers. The invention facilitates preventing break of seal collars, and also preventing possibility of warp of axis of the facility relative to axis of the well due to improved design of the lower sub.

EFFECT: preventing break of seal collars, and also preventing possibility of warp of axis of facility relative to axis of well due to improved design of lower sub.

3 dwg