Custom-designed dynamically positioned vessel for riserless light well intervention and saturation diving

Year built
metric tons gross tonnage
374 ft
Overall length
Max. divers in saturation
23-ft × 16-ft [7-m × 5-m] moonpool
Main winch: Rated to a safe working load of 150-metric-tons hookload capacity in both passive and active heave compensation (AHC) modes.
Subsea crane: AHC lifting capacity of 45 metric tons
Track record: Intervened in >700 wells and decommissioned >200 live and suspended wells across 15 subsea fields

Since 1987, the Seawell has been operating throughout the North Sea, providing subsea well intervention solutions and pioneering subsea light well intervention (LWI).

This DP2 LWI and saturation diving vessel features a purpose-built module handling system (MHS) tower positioned over a moonpool. The custom design and multiservice capability significantly reduce intervention time and provide a cost-effective method of maintaining subsea well stock through well maintenance and production enhancement solutions.

The Seawell’s MHS is capable of deploying both 5-in and 7-in subsea intervention lubricator (SIL) systems to 1,640-ft [500-m] water depth. This includes the 7 3/8-in electrohydraulic SIL, which enables communication with latest-generation subsea trees. The tower also incorporates guide-wire tensioners and winches, active and passive podlines, and constant-tension launch and recovery system (LARS) winches.

Built-in vessel tanks provide generous storage for chemical treatment (pumping) capabilities.

Seawell: Dynamically positioned vessel for riserless light well intervention and saturation diving