SHOE-VALVE FOR INSTALLATION OF PROFILE TAIL PIECE IN WELL Russian patent published in 2010 - IPC E21B29/10 

FIELD: gas-and-oil industry.

SUBSTANCE: facility consists of threads for connection with tail piece and of case with central channel with valve element installed therein movably-coaxial to its geometrical axis. The valve element has a pass channel coupled with a cavity of the tail-piece by means of orifices. The valve element is fixed against lengthwise travels with an arrester in from of a lock ring. Also on top the valve element is equipped with a head with external conic circular grooves and is fixed against rotation relative to the case. Orifices for communication of the pass channel of the valve element with the cavity of the tail piece are lengthwise. The pass channel is equipped with a back ball valve. A deflecting spring-loaded disk valve shutting off the central channel is installed in the cavity in the lower part of the case. From below the valve element is equipped with an inclined pusher interacting with and deflecting the disk valve in a transport position.

EFFECT: raised efficiency, and expanded functionality.

2 dwg