engin de forage en mer

CONT: Il y a aujourd'hui trois grandes familles d'engins de forage en mer : les navires de forage, les plates-formes auto-élévatrices et les plates-formes semi-submersibles.
CONT: [...] le SS-55T est utilisé pour des missions de desserte des plates-formes de forage pétrolier en mer [...]

CONT: Offshore units used by the petroleum industry to explore, develop, and produce oil and gas can be categorized as follows: 1. Fixed platforms, ... permanently attached to the ocean floor and ... not moveable. 2. Mobile platforms ... designed for mobility and intended to be at a given location a limited time period. The three general types of mobile platforms are: (a) the self-elevation units ; (b) the surface-type units (ship units and barge units) ; and (c) column-stabilized or semisubmersible units.
CONT: There are four basic forms of offshore rig: (a) Fixed Multi-well Platform ; (b) Mobile Jack-up Platform ; (c) Drill ship ; (d) Semi-submersible Platform.
CONT: As the men got farther out into the Gulf, they began to see many offshore rigs with their platforms, and tall derricks, where drilling was going on. Those on which drilling had finished and derricks were removed are also called platforms.