SHOE FOR INSTALLATION OF SHAPED OVERLAPPING MECHANISM IN WELL Russian patent published in 2012 - IPC E21B29/10 

FIELD: oil and gas industry.

SUBSTANCE: shoe for installation of shaped overlapping mechanism in a well includes housing with central through channel with a seat and above located annular projection, hollow valve. Hollow valve is blanked off from below, equipped with side channels, located in central channel with possibility of longitudinal upward movement till interaction with the seat. Besides, hollow valve is fixed in lower position with a destructible connection and equipped with spring-loaded fastener interacting with annular projection with fastening in upper position. Besides, side channels are provided with possibility of tight overlapping by means of housing in upper position. Valve is prefabricated and consists of external sleeve with destructible connection and spring-loaded fastener and core with below located tangential side channels. At that, core is inserted into external sleeve with possibility of rotation. Core is equipped with a cone at the bottom, which is convergent downwards, with external screw slots.

EFFECT: improving operating reliability.