Semi-Submersible
Semi-Submersible is one of the drilling rig design concepts for offshore shallow water environments.
1. Water depth range: 30 – 1000m
2. Environmental Impact low
3. Not suitable for ice
4. Suitable for exploration and development. Easily moved between locations. Rig up time, essentially zero. Wells will be sub-sea completions – more costly and may still need local installation for process etc.
5. Extensively used in the southern Caspian sea. Not recommended to refurbish and existing rig. Will probably need to be manufactured outside and imported.