In situ method and apparatus for inspecting and repairing subsea wellheads
US4401164A · kind A · utility
58Cited by
10References
25Claims
0Family size
Inventor
Key dates
| Filing date | Apr 24, 1981 |
| Grant date | Aug 30, 1983 |
| Priority date | — |
| Expiry date | Apr 24, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B41/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A marine riser having a pair of hydraulic lines, such as choke and kill lines, secured thereto and substantially parallel to one another providing track means extending along substantially the full length of a multiple joint riser string for transporting a carriage along the riser from near the top to the bottom. The invention also includes a carriage adapted to travel along such track and also includes television camera and lights as well as manipulator means for performing various functions on a blow-out preventer stack and wellhead connector as well as associated equipment positioned at the lower end of the marine riser.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.