Combination offshore drilling rig
US4602894A · kind A · utility
34Cited by
15References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 30, 1985 |
| Grant date | Jul 29, 1986 |
| Priority date | — |
| Expiry date | May 30, 2005 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02B17/021
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A combination offshore drilling rig which combines the desirable features of a slot-type drilling rig and a cantilever-type drilling rig while eliminating the limitations and undesirable features associated with either type of such rigs. The combination offshore drilling rig mounts the derrick and drilling equipment on a movable cantilever structure which may be positioned over a slot of sufficient area to permit the drilling operation to be carried out through the slot or may be moved outboard of the peripheral boundary of the rig hull to perform a drilling or workover operation outside the peripheral boundary of the rig hull.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.