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Message: <blockquote data-quote="Kid Glock" data-source="post: 4124056" data-attributes="member: 189">Tubing used to produce the well or deliver product from the formation down hole to the surface. Also, may see it used as lead line for moving product from the well head to tanks or processing equipment, ie; oil/gas/water separator, etc. As opposed to regular line pipe being used.The upset is a thickening of pipe near the connection to re-enforce the threaded portion. It's readily visible as the OD is increased creating the "upset".Not saying it doesn't exist, as there's lots I have never seen, but 2-3/8 drill stem is one of them.ETA:Been a long time ago (1980's) but IIRC, 3-1/2" is smallest drill pipe I've seen.</blockquote>