Marine riser
AssigneePetroleum Equipment Supply Engineering Company Limited
InventorTimothy John Woodrow
Life of this patent
Estimating the term…
Abstract
A marine riser has couplings with screw-threads for securing marine riser sections together, and a carousel mechanism for coupling auxiliary lines to the marine riser sections at various locations along the sections to permit the lines to rotate freely relative to the marine riser sections as the sections are rotatably assembled. The marine riser also has a buoyancy module which houses choke and kill lines in buoyancy module fairing portions.
Claims35
A marine riser comprising:
- a plurality of marine riser sections, each marine riser section having screw-threaded ends and coupling means for connecting said screw-threaded ends together;
- rotary drive coupling means for engaging with a rotary drive mechanism;
- each marine riser section having a plurality of spaced brackets secured to the marine riser section along its length;
- auxiliary line support means for receiving at least one auxiliary line, said auxiliary line support means being rotatably mounted to said spaced brackets whereby, when two marine riser sections are coupled together by rotary movement the auxiliary line support means is free to rotate relative to the riser sections to minimise rotary forces being applied to the auxiliary lines and allow vertical alignment of auxiliary lines for connection.
A buoyancy module as claimed in 21 wherein said buoyant material is syntactic foam.
A marine riser section comprising:
- screw-threaded ends and coupling means for connecting said screw-threaded ends together;
- rotatable drive coupling means for engaging with a rotary drive mechanism;
- a plurality of spaced brackets secured to the marine riser section along its length;
- auxiliary line support means for receiving at least one auxiliary line, said auxiliary line support means being rotatably mounted to said spaced brackets,
- whereby the auxiliary line support means is free to rotate relative to the riser section to minimize rotary forces being applied to the auxiliary lines and allow easy rotation of auxiliary lines.
A method of connecting marine riser sections together to form a marine riser, said method comprising the steps of:
- supporting a first riser section to display a first screw-thread end for coupling;
- locating a second riser section above the first riser section, where the second riser section has a second different screw-thread end for coupling to the said first end;
- rotating said second riser section such that the first and second ends form a screw-thread coupling;
- and coupling at least one auxiliary line to the riser section and allowing the auxiliary line to rotate freely relative to the riser to facilitate vertical alignment with adjacent riser sections.
A method of connecting marine riser sections together to form a marine riser, said method comprising the steps of:
- supporting a first riser section to dispose a first female screw-thread end for coupling;
- locating a second riser section above the first riser section, said second riser section having a female screw-threaded end for coupling;
- providing a dual male threaded riser coupling between said first and second riser sections and securing the coupling to said first riser section and then rotating said second riser section such that the cond riser and said dual threaded coupling first and seform a threaded riser coupling;
- and coupling at least one auxiliary line to the riser section and allowing the auxiliary line to rotate freely relative to the riser to facilitate vertical alignment with adjacent riser sections.
Dependencies are inferred from the claim text.