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Upsets
An upset – located at either end of a joint of drill pipe and to which is attached a threaded connection, or tool joint – is thicker than the rest of the drill pipe tube to provide for stronger welds. Drill pipe upsets can be either internal, external or internal-external.
- In an internal upset, extra wall thickness is added by decreasing the pipe’s inside diameter at the upset area; the outside diameter does not change (Figure 1).
- In an external upset, extra wall thickness is added by increasing the pipe’s outside diameter at the upset area; the inside diameter does not change (Figure 2).
- In an internal-external upset, extra wall thickness is added by decreasing the pipe’s inside diameter and increasing its outside diameter at the upset area (Figure 3).
