EXPANDER-CALIBRATOR Russian patent published in 2010 - IPC E21B29/10 

FIELD: oil and gas production.

SUBSTANCE: facility consists of case with central channel, threads for connection with downhole equipment and recesses on external surface, wherein there are arranged rollers mounted on axles and made as cylinders with faces. Upper ends of axles perform restricted travel outside when interacting with conic surface of a circular piston, spring loaded upward, installed in the central channel of the case and designed to perform axial displacements. Lower ends of axles are inserted into bushings. The bushings are inserted into the case and perform restricted radial travels outside. The bushings and upper ends of the axles are spring loaded inside the case. The circular piston is equipped with a rod from below. A lower circular piston with upper conic surface interacting with the bushings is installed between the rod and the central channel below recesses. The circular piston is spring loaded from the lower circular piston. A flow section of the central channel of the case narrows from below.

EFFECT: upgraded quality of expanding, increased resource and reliability of facility, elimination of emergencies.

4 cl, 3 dwg