| 摘要 |
<p>A riser (18) extends between a surface vessel, e.g. a drillship (16), and an item of subsea equipment, e.g. a blowout preventer valve (12) on the seabed (10). The riser (18) is equipped with at least one thruster, for instance in the form of one or more motor driven positional propellers (201, 202), which is arranged so as to be able to exert an essentially horizontal thrust force on the riser (18) in order to counteract the lateral forces from the oceanic currents, so as to maintain the riser (18) in a position that corresponds to the desired course from the surface vessel (16) to the subsea equipment (12).</p> |
