| 摘要 |
A deep water riser assembly includes a lower BOP stack positioned adjacent and anchored to the bottom of the ocean and an upper BOP stack attached to the riser at a water level just far enough below the surface to be unaffected by surface currents. The upper BOP stack has shear rams above the pipe rams to sever the section of the drill pipe above the shear rams to allow the upper section of the drill pipe between the shear rams and the drill ship to be retrieved followed by the section of riser above the upper BOP stack to free the drill ship to move as required to better weather a surface storm. A floatation module is attached to the riser below the upper BOP stack and exerts an upward force that holds the riser below the upper BOP stack free-standing and in tension. Means are provided to reconnect the upper section of the riser to the upper BOP stack after the storm has passed.
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