Mechanical anti-rotational feature for subsea wellhead housing
US6695059B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 2001 |
| Grant date | Feb 24, 2004 |
| Priority date | — |
| Expiry date | Nov 13, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/035
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An anti-rotation device prevents an inner wellhead housing from rotating within an outer wellhead housing. The anti-rotation device provides spring loaded anti-rotational keys within the outer wellhead housing and mating slots formed within the inner wellhead housing. The keys face inwards to the inner wellhead housing, are circumferentially spaced apart around the outer wellhead housing, and located between the two tapered shoulders. As the inner wellhead housing lands in the outer housing, the inner wellhead housing pushes the keys of the outer wellhead housing to a retracted position. The inner wellhead housing is then rotated within the outer wellhead housing until the spring loaded keys align with the slots and extend into the slots of the inner wellhead housing. Any rotational force on the inner wellhead housing will be resisted by the anti-rotational mechanism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.