Oil well pipe for a casing
US5564413A · kind A · utility
6Cited by
10References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 29, 1994 |
| Grant date | Oct 15, 1996 |
| Priority date | — |
| Expiry date | Aug 29, 2014 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/00
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An oil well pipe for a casing, comprising an oil well body, a sliding layer formed on an outside surface of the oil well body and a protective layer formed on an outside surface of the sliding layer, the sliding layer contains an ethylene-vinyl acetate copolymer having 5 to 60 weight % vinyl acetate. The sliding layer may also contain a maleic acid modified polyethylene or the ethylene-vinyl acetate copolymer may be a maleic acid modified ethylene-vinyl acetate copolymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.