Deepwater riser system
US6161620A · kind A · utility
30Cited by
24References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1997 |
| Grant date | Dec 19, 2000 |
| Priority date | — |
| Expiry date | Dec 23, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/004
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A deepwater riser assembly is disclosed for a riser connecting subsea equipment to a surface wellhead. A buoyancy can assembly provides an open ended buoyancy can tube which surrounds the upper end of the riser and an upper seal which effectively closes the annulus between the riser and the buoyancy can tube. A load transfer connection in the buoyancy can assembly then connects the riser to buoyancy can tube. A pressure charging system communicates with the annulus between the riser and the buoyancy can tube below the upper seal. Injecting gas into this annulus then provides support to the riser.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.