METHOD FOR EXPANDING A STEEL TUBING AND WELL WITH SUCH AS TUBING

摘要

A tubing (4) made of a formable steel grade which is subject to strain hardening without incurring any necking or ductile fracturing as a result of the expansion process is expanded by moving an expansion mandrel (5) having a non-metallic tapering outer surface through the tubing, thereby increasing the strength of the tubing while expansion forces remains low.