Riser system for sub-sea wells and method of operation
US6161619A · kind A · utility
Inventor
Key dates
| Filing date | Feb 3, 1999 |
| Grant date | Dec 19, 2000 |
| Priority date | — |
| Expiry date | Feb 3, 2019 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/0135
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An intervention riser for an oil or gas well, which forms a connection between the well head and a floating surface vessel, is sufficiently flexible to accommodate the relative vertical movement between and the well head and a floating surface vessel, is attached to a compensating deck on the vessel which is free to move vertically relative to the vessel, and has winching means having a winch line attached to the riser such that the winching means may pull upon the riser. The compensating deck comprises a deck surface supported on at least one vertically arranged gantry support. The riser system comprises a lower riser section which extends substantially vertically and is essentially rigid, being maintained under tension, and a flexible upper riser section to accommodate movements in the surface vessel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.