Surface wellhead
US4794988A · kind A · utility
26Cited by
2References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 22, 1987 |
| Grant date | Jan 3, 1989 |
| Priority date | — |
| Expiry date | Jun 22, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/043
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Surface wellhead apparatus for use in tying-back casing from a subsea structure to a surface structure or when drilling with mudline-supported casing hangers wherein the casing is maintained in tension by means of a lock member which releasably engages with a support surface, the lock member and support surface being, on release, relatively movable in a direction longitudinal of the casing and, on engagement, locked against downward movement of the casing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.