METHOD OF TUBE EXPANDING INTO WELL Russian patent published in 2004 - IPC

FIELD: well drilling equipment, particularly for expanding profiled capping devices when arranging thereof into well.

SUBSTANCE: device includes body with central channels. Body is provided with threads for connection thereof with downhole equipment. Made on outer body surface are depressions for rolls arrangement. Rolls are installed on axles. Upper axle ends are detachably secured in body. Lower axle ends are secured in supports by hinges, which provide rotation thereof in plane passing through longitudinal roller and body axes. Supports are arranged in body. Hydraulic annular piston is arranged in central channel. Annular piston is spring-loaded in axial direction and has pushers. Upper axle ends are located so that radial clearance is formed around upper axle ends. Upper axle ends cooperate with pushers.

EFFECT: extended device capabilities due to increasing expanded tube diameter.

2 cl, 4 dwg