Hydraulic and earth engineering – Marine structure or fabrication thereof
Patent
1986-12-01
1988-03-29
Stodola, Nancy J.
Hydraulic and earth engineering
Marine structure or fabrication thereof
405224, 114264, 166367, 175 7, E02D 2100, B63B 3544, E21B 7128
Patent
active
047339918
ABSTRACT:
An adjustable riser top joint for connecting an offshore subsurface well to a deck mounted welltree. A first plurality of generally annular protrusions 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. A second plurality of protrusions 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. The generally annular protrusions are formed as a continuous spiral groove 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.
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Conoco Inc.
Stodola Nancy J.
Thomson Richard K.
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