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→Floaters
Offshore rigs that are not attached to or resting on the ocean bottom are called ''floaters''. These rigs can drill in water depths deeper than jackups or platforms can. They have several special features to facilitate this:
Offshore rigs that are not attached to or resting on the ocean bottom are called ''floaters''. These rigs can drill in water depths deeper than jackups or platforms can. They have several special features to facilitate this:
* They are held on location by anchors or dynamic positioning.
* They are held on location by anchors or [[dynamic positioning]].
* The drill string and riser are isolated from wave motion by motion compensators.
* The [[drill string]] and riser are isolated from wave motion by motion compensators.
* The wellheads and BOPs are on the ocean bottom and are connected to the rig by a riser to allow circulation of drilling mud.
* The wellheads and [[Blowout preventers|BOPs]] are on the ocean bottom and are connected to the rig by a riser to allow circulation of drilling mud.
There are two categories of floaters: semisubmersibles and drill ships.
There are two categories of floaters: semisubmersibles and drill ships.