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- ...rigs have more than one crane to ensure that all areas are accessible. A ''riser'' is used to extend the wellhead from the mudline to the surface. On [[Offs ...ww-odp.tamu.edu/publications/tnotes/tn31/pdf/drill_s.pdf drill string] and riser are isolated from wave motion by motion compensators.7 KB (1,016 words) - 16:56, 20 January 2022