CASING PIPE REPAIR DEVICE Russian patent published in 2005 - IPC

FIELD: oil production industry, particularly means to provide recovery of casing pipe air-tightness.

SUBSTANCE: device has connection pipe rigidly connected to pipe string and expanding cone. Connection pipe is provided with expanded parts located from top and bottom ends thereof. Expanding cone may press connection pipe to casing pipe and has diameter of the base less than inner diameter of the connection pipe installed in its working position. Circulation valve is arranged in lower expanded part and opens flow in top-bottom direction. Valve body is air-tightly connected to the connection pipe with shear screws. Expanding cone is inserted in upper expanded part and has seat for droppable valve. Connected to expandable cone is collar self-sealing in top-down direction. Connection pipe plasticity exceeds that of pipe string. Elastic shell is connected to outer connection pipe surface.

EFFECT: increased isolation of damaged part and reduced material consumption.

3 cl, 3 dwg