Casing hanger lockdown with conical lockdown ring
US8978772B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 2011 |
| Grant date | Mar 17, 2015 |
| Priority date | — |
| Expiry date | May 24, 2033 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A seal seals an annulus in a subsea assembly between a wellhead and a casing hanger landed on a shoulder within a bore of the wellhead. The seal includes a casing hanger seal ring disposed within the annulus. The seal ring engaged with an inner diameter surface of the wellhead, and engaged with an outer diameter surface of the casing hanger so that the seal ring prevents flow through the annulus. A nose ring is secured to a lower end of the seal ring so that, when the seal ring is energized, a conical surface of the nose ring engages a mating conical profile formed in the inner diameter surface portion of the wellhead and the nose ring engages a surface opposite the conical surface with a substantially smooth outer diameter surface portion of the casing hanger to limit upwards axial movement of the casing hanger.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.