Deep ocean riser positioning system and method of running casing
US6352114B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1998 |
| Grant date | Mar 5, 2002 |
| Priority date | — |
| Expiry date | Dec 11, 2018 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/035
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A deep ocean drilling system is disclosed for drilling offshore wells in extremely deep water using smaller and more economical drilling vessels. The system utilizes a reduced diameter drilling riser that reduces the size and cost of conventional floating drilling unit. The reduced diameter drilling riser is detached from the blowout preventer stack and repositioned and attached to a mud return assembly. Large diameter casing is lowered into the wellbore outside of the reduced diameter riser. Thereafter, the reduced diameter drilling riser is released from the mud return assembly and repositioned over and reconnected to the blowout preventer stack.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.