| 摘要 |
<p>An adjustable riser top joint (22) for connecting an offshore subsurface well to a deck mounted welltree (32). A first plurality of generally annular protrusions (28) on the riser top joint section affords a plurality of connecting points for the wellhead tree using either a unitary or a split collar type attachment (34). A second plurality of protrusions (28) positioned below deck afford a second plurality of connecting points for riser tensioning means that may also, preferably, be attached using either a unitary or a split collar (40). The generally annular protrusions are formed as a continuous spiral groove (30) on an external surface of the riser section in a first preferred embodiment and as a series of generally cylindrical protrusions of equal length and spacing in a second preferred embodiment (not shown).</p> |
