| 摘要 |
A floating platform comprising in combination a semisubmersible vessel having two or more pontoons 10, buoyant columns 11 upstanding from those pontoons and a deck 12 supported on the columns (the semisubmersible vessel being of a kind known per se); and a raft 21 comprising a hull 22 having a planform greater than the planform of the vessel and two or more buoyant caissons 23 disposed at or near lateral extremities of the raft 21 and configured so that the raft is capable of floating in a stable attitude with the hull of the raft submerged to such a depth that the vessel can float over the hull of the raft with only the buoyant caissons 23 of the raft piercing the water surface, in which the pontoons 10 of the vessel are secured to upper surfaces of the hull 22, Drilling facilities 32 on the vessel can be used to drill and complete wells 24 with surface wellheads which can subsequently be transferred to and connected to raft mounted production equipment 25. |
