Method and apparatus for connecting a riser pipe to blow out preventer stack at the head of an oil well
US4062402A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1976 |
| Grant date | Dec 13, 1977 |
| Priority date | — |
| Expiry date | Nov 3, 1996 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/038
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Method for externally connecting a riser pipe, at great depths beneath a body of water, to the B.O.P Stack of a well, said riser pipe and B.O.P Stack carrying registering eccentric tubes. In this process the riser pipe is centered on the B.O.P Stack by resting a bearing surface on the outside of the bottom of the riser pipe on a bearing surface on the outside of the top of the B.O.P. Stack, bringing the eccentric tubes into registration by rotating the riser pipe relative to the B.O.P. Stack and mechanically connecting, seating and locking the riser pipe to the B.O.P Stack, while separating the bearing surface on the bottom of the riser pipe from the bearing surface on the top of the B.O.P Stack and, finally, connecting the eccentric tubes. SP This is a continuation, of application Ser. No. 668,313, filed Mar. 18, 1976, now abandoned.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.