Expandable tubulars (ET) are being used increasingly by the oil and gas industry during the drilling, completion and workover phases of wells. Expandable systems potentially offer great economic benefit by simplifying string design, reducing costs and allowing access to previously uneconomic wells, especially those in deep water. The expansion process involves cold-working steel tubulars, a process that by its very nature is highly non-linear due to material yielding, tight contact, sliding and friction. The expansion process can have a significant effect on the expandable systems' material properties and behavior. In...

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