Semisubmersible Drilling Rig

Definition - What does Semisubmersible Drilling Rig mean?

A Semisubmersible Drilling Rig is a nautical vessel that is mobile in nature and can be floated to a mobile location to perform offshore drilling activities. During drilling operations the rig is supported by large pontoons submerged in the water. The deck is connected and supported by large diameter buoyant columns at the corners and small intermediate columns that are connected to the pontoons.

Petropedia explains Semisubmersible Drilling Rig

  • The semisubmersible drilling rigs are similar to complete submersible drilling rigs; however, certain differentiating characteristics exist like the fact that semisubmersible rigs are not self propelled and they need to be towed to the necessary offshore oilfield location, while the submersible drilling rigs are self propelled.

The semisubmersible drilling rigs are also known as anchored or moored semisubmersible and can drill in water depths up to 1500 meters and dynamic positioning semisubmersibles can drill beyond water depths of 6000 meters.

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