Riser system comprising pressure control means
US9022127B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 2008 |
| Grant date | May 5, 2015 |
| Priority date | — |
| Expiry date | Aug 13, 2031 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/076
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention regards a riser system comprising at least one riser extending from a subsea wellhead to a surface vessel, tension means for keeping the at least one riser tensioned, which tension means are connected to the vessel, a upper workover riser package (UWRP) located at the upper section of the riser and arranged to seal off the riser passage.According to the invention the UWRP is located below the connection point of the tension means to the vessel, giving the UWRP a position stationary relative a seabed, and that the UWRP comprises an interface adapted for the connection of different kinds of workover equipment. The invention also regards a method for inserting tools into a riser.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.