Tools for shallow flow wellhead systems
US5791418A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 1996 |
| Grant date | Aug 11, 1998 |
| Priority date | — |
| Expiry date | May 10, 2016 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/143
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A tool is employed to shift an external valve sleeve on an outer wellhead housing at a subsea location. The tool has an engaging member that moves between upper and lower positions. The tool has a locking member that locks to the inner wellhead housing with the engaging member sliding over the outer wellhead housing. In one embodiment, the tool also is employed to run the inner wellhead housing and preload it. The engaging member moves to a lower position to shift the valve sleeve after the inner wellhead housing has been preloaded by the tool. In another embodiment, the tool is lowered over a previously installed inner wellhead housing to retrieve the valve sleeve for repair or replacement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.