Mudline subsea wellhead system
US5240081A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1992 |
| Grant date | Aug 31, 1993 |
| Priority date | — |
| Expiry date | Sep 8, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/043
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A subsea well drilling and completion system allows the use of a jack-up rig for drilling with completion by a floater rig. The system uses an outer wellhead housing which is run on releasable conductor riser. An inner wellhead housing is lowered through the conductor riser and lands in the outer wellhead housing. Cement returns flow through a plurality of cement ports in the outer wellhead housing. A first hanger lands in the inner wellhead housing and supports an intermediate string of casing. The first hanger has a mudline profile in its interior. A second hanger supports a second string of casing and latches into the mudline profile. After drilling, tieback adapters are secured to each hanger for sealing to the inner wellhead housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.