WELL PIPE EXPANSION DEVICE Russian patent published in 2022 - IPC E21B29/10 

FIELD: mining; drilling of soil or rocks.

SUBSTANCE: invention relates to drilling and repair of wells and is intended, in particular, for expansion and calibration of devices from shaped pipes. Device comprises upper stop and lower stop with a set of molding sectors installed between them with the possibility of limited radial movement by limiters. Upper and lower stops are made integral with the housing. Forming sectors are equipped with spherical working surface and are installed in slots of housing equipped with central channel, in which barrel with radial holes is installed. From above and from below the housing is equipped with adapters forming with the barrel upper and lower hydraulic chambers, in which movable spring-loaded conical pistons are installed with the possibility of limited movement along the barrel towards each other. Conical pistons interact with molding sectors 3 and push the molding sectors outwards when pressure drop is created in the barrel equipped with a nozzle. Adapter is provided with thread from above for connection with drill string.

EFFECT: higher reliability, simplified design, ruled out jamming in inclined and horizontal wells, gradual expansion of pipes.

1 cl, 3 dwg