Why do oil rigs sway?

On land oil rigs never sway. They are erected on some heavy structures called 'bottom box' which is even made heavier by filling water into them prior to erection of mast. read more

Compared to typical boats, oil rigs have very low waterplane areas. That is, most of their buoyancy is far below the waves, and the parts piercing the surface are relatively narrow. This is apparent on pictures 3,5,6,7 linked above. read more

Steve Maley, Oil & Gas Lifer, All-Around Good Guy Answered Feb 18, 2018 · Author has 1k answers and 485.4k answer views On an offshore rig, I would imagine it would be a galley hand or a steward — although nowadays they may have an updated job title. read more

A barge rig is simply sunk and flooded with water in the ballast tanks, a Jack-Up rig has 3–4 hydraulically controlled legs that are lowered to the sea floor and then lifts the rig out of the water about 70′. read more