Dynamically positioned, concentric riser, drilling method and apparatus
US6273193A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1998 |
| Grant date | Aug 14, 2001 |
| Priority date | — |
| Expiry date | Dec 16, 2018 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/002
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A dynamically positioned, concentric riser, drilling system comprising a dynamically positioned drilling unit operable to float at least partially above the surface of a body of water, a first, outer, low-pressure, marine riser extending from the drilling unit into the body of water, a tensioning system to support the first marine riser, a second, inner, high-pressure, marine riser concentrically extending within the first, outer, low-pressure, marine riser, a surface blowout preventor, a lower marine riser package, a subsea blowout preventor, and a connector at the base of the lower marine riser package to release the risers from the wellhead in the event of a loss of station of the drilling unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.