FIELD: oil and gas industry.
SUBSTANCE: expanding device having front and rear mandrels is lowered into the column. Front mandrel having smaller size is used for expansion of column as the device is being moved in the column. When the corresponding depth is achieved, front mandrel is borne against limit stop. Rear mandrel having larger size is released by means of cams - limit stops fixed in the groove by applying lifting force. Additional expanded part is formed with rear mandrel on lower pipe end.
EFFECT: expansion of pipe from top to bottom during one run is provided.
19 cl, 14 dwg
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