Support means for a well riser or the like
US3984990A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 9, 1975 |
| Grant date | Oct 12, 1976 |
| Priority date | — |
| Expiry date | Jun 9, 1995 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/012
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Improvements in support means for well risers wherein the risers extend through a rotary table on a floating vessel down to a subsea well. A spider supports the upper end of the riser and hydraulically operated gimbal means support the spider with respect to the table to maintain a constant load on the riser. Inertia absorbing means is associated with the gimbal means so that, when sections or buoyancy chambers or the like are added to the riser and it is lowered down to the well, or vessel movement takes place, any off-center load that is acting on the spider that is not equally distributed, the inertia absorbing means absorbs such load and equally distributes it so as to maintain a constant load on the riser.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.