CASING PIPE CENTRATOR Russian patent published in 2006 - IPC E21B17/10 

FIELD: mining industry, particularly casing pipe cementing inside well.

SUBSTANCE: device comprises casing pipe, working cylinder with annular piston installed outside the casing pipe. Inner cavities of working cylinder and casing pipe are communicated with each other by means of through channels closed with breakable plugs. Main and additional centering members are made as levers having cross-sections defining tubular billet sectors. The first ends of main cementing members are pivotally connected with clutch. The first ends of additional cementing members are fastened to lower piston end. Free ends of main and additional cementing members are pivotally connected with each other in pairs. Angle between each cementing member axis and casing pipe axis exceeds 90° in working position.

EFFECT: increased reliability of opened cementing member fixation during casing pipe cementing.

3 dwg