| 摘要 |
Disclosed are compliant variable tension risers ( 106 ) to connect deep-water subsea wellheads ( 102 ) to a single floating platform ( 104 ). The variable tension risers ( 106 ) allow several subsea wellheads ( 102 ), in water depths from 4,000 to 10,000 feet, at lateral offsets from one-tenth to one-half of the depth, to tie back to a single floating dry tree semi-submersible platform ( 104 ). Also disclosed are methods to counter buoyancy and install variable tension risers using a weighted chain ballast line ( 228, 230 ).
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