CENTERING DEVICE FOR CASING STRINGS Russian patent published in 2004 - IPC

FIELD: mining industry. SUBSTANCE: device has centering boards, fixed to rings on casing string, and clamping device, placed inside the rings. Clamping device is a fixing ring with end portions, parallel planes of which form a sharp angle with each of opposite ring generatrices. Stopping pieces, supported by pipe, are placed proximate to sharp angle vertex. Perpendicularly to said stopping pieces stops are placed in the center of fixing ring generatrices, around axes of which fixing ring can turn. EFFECT: reinforced connection of fixing ring to pipe body. 2 dwg