Wellhead assembly
US4515400A · kind A · utility
7Cited by
9References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1982 |
| Grant date | May 7, 1985 |
| Priority date | — |
| Expiry date | Mar 15, 2002 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A wellhead assembly with an increased through bore for passing slightly oversized drill bits therethrough with a substantially reduced landing shoulder, and an improved landing assembly which transfers a portion of the stresses through the energizing ring and support ring into the wellhead body along the straight bore above said landing shoulder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.