SHOE FOR INSTALLATION OF SHAPING STRUTOFF DEVICE IN WELL Russian patent published in 2003 - IPC

FIELD: well drilling, particularly, devices for installation of shaping shutoff devices for isolation of drilling complication zones. SUBSTANCE: shoe for installation of shaping shutoff device in well includes body with central through channel and thread for connection with shutoff device, seat and ball valve. Shoe has insert. Ball valve is located in hollow made in body wall and spring-loaded. Ball valve seat is made in form of bushing coaxially installed in body through channel movably relative to its axis. Bushing is locked from longitudinal motion by retaining ring located in annular bore made in insert. Retaining ring operates with rising hydraulic pressure in body through channel. Body wall has channels communicating body central through channel and hollow for ball valve with ambient space. EFFECT: extended functional potentialities of shoe and higher quality of shutoff of wells by shaping shutoff devices. 2 dwg