High-capacity single-trip lockdown bushing and a method to operate the same
US9376881B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 2012 |
| Grant date | Jun 28, 2016 |
| Priority date | — |
| Expiry date | Oct 19, 2034 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/0422
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A high capacity single trip lockdown bushing and a method to operate the same is disclosed. The lockdown bushing includes a tubular body that carries a locking ring and an energizing ring about an upper portion of the tubular body. The energizing ring includes a cam portion interposed between the locking ring and the tubular body so that the cam portion and the locking ring overlap along mating cam surfaces in an unset position. A running tool carries the lockdown bushing to land on a casing hanger. The running tool is actuated to drive the energizing ring downward so that the mating cam surfaces interact to move the locking ring radially outward into engagement with wickers formed in a wellhead.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.