Company: RIG
Filing Date: 2025-02-18
Form Type: 10-K
Source: 0001451505-25-000018
Chunk: 54

Company: Transocean Ltd.
Filing Date: 2025-02-18
Form: 10-K
Item: Item 1
Chunk 54
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Drillships are floating vessels that are shaped like conventional ships, generally self-propelled and considered to be the most mobile of the major rig types.  Drillships typically have greater deck load and storage capacity than semisubmersible rigs, which provides logistical and resupply efficiency benefits for customers.  Drillships are generally better suited to operations in calmer sea conditions and typically do not operate in areas considered to be harsh environments.  All of our high-specification drillships are equipped with dynamic positioning thruster systems, which allows them to maintain position without anchors through the use of onboard propulsion and station-keeping systems.  We have two ultra-deepwater drillships that are equipped with an industry-leading, 1,700 short ton hoisting capacity.  We have 23 ultra-deepwater drillships that are equipped with our patented dual-activity technology.  Dual-activity technology employs structures, equipment and techniques using two drilling stations within a dual derrick to allow these drillships to perform simultaneous drilling tasks in a parallel, rather than a sequential manner, which reduces critical path activity and improves efficiency in both exploration and development drilling.

Semisubmersibles are floating vessels that can be partially submerged by means of a water ballast system such that the lower column sections and pontoons are below the water surface during drilling operations.  Semisubmersibles are known for stability, making them well suited for operating in rough sea conditions.  Semisubmersible floaters are capable of maintaining their position over a well either through dynamic positioning or the use of mooring systems.  Although most semisubmersible rigs are relocated with the assistance of tugs, some units are self-propelled and move between locations under their own power when afloat on pontoons.  Three of our nine semisubmersibles are equipped with dual-activity technology and also have mooring capability.  Two of these three dual-activity units are custom-designed, high-capacity semisubmersible drilling rigs, equipped for year-round operations in harsh environments, such as those of the Norwegian continental shelf and sub-Arctic waters.

Our fleet consists of ultra-deepwater drillships and semisubmersibles and harsh environment semisubmersibles that are designed with high-specification capabilities to operate in the technically demanding regions of the global offshore drilling business.  Ultra-deepwater floaters