| 摘要 |
<p>The platform (10) is anchored in the area of the deposit. The riser (24) is connected to reach a first point (30) on the seabed (F) from the platform and is then connected to the first point. The riser is then disengaged from the first point, keeping it submerged and its free end is moved to connect to a second point (32). The step of moving the free end of the riser involves the previous establishment of at least one fixed point (34a, 36a, 38a) on the seabed; positioning means of traction between the free end of the riser and the or each fixed point; and pulling the free end of the riser relative to the fixed point(s) to move it relative to the seabed to the second point. Three nonaligned fixed points are anticipated, so the riser moves under the action of three non coaxial forces. The free end of the riser is connected to at least one and preferably two moorings and the intervention points are in the area swept by the mooring or in the overlap between the two mooring circles. The fixed points and means of traction are established by a submersible engine, possibly during the anchoring of the platform.</p> |
