Riser tensioner conductor for dry-tree semisubmersible
US9562403B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 2014 |
| Grant date | Feb 7, 2017 |
| Priority date | — |
| Expiry date | Jul 18, 2034 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/002
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A top-tensioned riser system comprises a substantially vertical riser extending upward from the seafloor; a conductor surrounding an upper portion of the riser in spaced-apart relation; a coaxial keel guide surrounding a lower portion of the conductor; a tensioner attached to the conductor and the riser; a keel guide support structure attached to the keel guide and connected to the keel of a dry-tree, semi-submersible vessel; and, a keel joint centralizer attached to the riser proximate the keel guide and sized to prevent radial movement of the riser relative to the conductor. Side loads on the riser (such as those arising from displacement of the vessel from its nominal position or currents acting on the riser) are reacted from the riser to the conductor via the keel joint centralizer and then to the keel of the vessel via the keel guide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.