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A Floating Offshore Drilling Rig is a machine structured to drill exploration and development wells from mobile offshore. It is also used as a temporary storage facility for oil and natural gas. Depending on the depth of water and the remoteness of the area, a different type of a rig is used.
Deep water rigs float on large bunkers that can be filled and emptied of water as ballast. The bunkers are connected to the drilling platform with large columns which are hollow. The rigs have dynamic positioning systems, as well as anchoring webs which prevent catastrophic movement during storms.
Compliant tower: Compliant-tower rigs are similar to fixed platforms, since both are anchored to the seabed and hold most of their equipment above the surface. ... This often means deepwater rigs are buoyant and semisubmersible, floating partly above the surface while pumping up oil from deep wells.