Offshore well drilling system with nested drilling risers
US9181753B2 · kind B2 · utility
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10References
21Claims
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Assignee
Inventors
Key dates
| Filing date | Dec 19, 2012 |
| Grant date | Nov 10, 2015 |
| Priority date | — |
| Expiry date | Jul 11, 2033 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/004
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An offshore well drilling system for drilling a subsea well, including a floating platform, an external riser extending from the subsea well, and an internal riser extending from the subsea well to the platform. The internal riser is nested within the external riser. The system also includes an external riser tension device to apply tension to the external riser. The system also includes an internal riser tension device, separate from the external riser tension device, to apply tension to the internal riser.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.