WELL PIPE FLARING DEVICE Russian patent published in 2010 - IPC E21B29/10 

FIELD: oil and gas industry.

SUBSTANCE: device includes housing with central channel and threads on ends. Main rollers are arranged on axes in cavities on outer surface of housing. Upper ends of axes are installed in housing in a detachable way with possibility of restricted outward movement - to working position, and lower ends - in hinged supports with the possibility of their being turned in cavity passing through longitudinal geometrical axes of housing and rollers. Hydraulic annular piston with sealing rings is arranged in central channel and has pusher which has the possibility of extending the rollers to working position. Upper cavities for additional rollers installed on upper axes are made above cavities of housing. Upper ends of axes interact with housing with possibility of restricted outward radial movement. Pusher is equipped with rotating upper and lower bushes which have the possibility of interacting from inside with additional and main rollers respectively. Recess is made in the housing from inside. Piston above sealing rings is equipped with outward spring-loaded fixture. Between piston and housing there tightly installed above fixture is hold-down bush with possibility of longitudinal downward movement and interaction with fixture to press it inward. Cavity between housing and piston above hold-down bush is interconnected to central housing channel.

EFFECT: improving reliability and operability, reducing material and power costs.

2 dwg