Method of expanding a tubular and expandable tubular
US10648298B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 2016 |
| Grant date | May 12, 2020 |
| Priority date | — |
| Expiry date | Jan 15, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2080/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A tubular member (1) with a relative rough (1.5-10 μm) inner surface (5) coated solid lubricating film (10) which is transformed into a substantially viscous rubbery viscoelasto-plastic phase at temperatures in a range between 50° C. and 110° C. is expanded by moving an expansion member (24) with a relatively smooth outer surface (roughness<1.5 μm) therethrough, such that during expansion a viscous viscoelastoplastic substantially rubbery lubricating film (44) is generated between the tubular member (1) and the expansion mandrel (24), which film remains bonded to the rough inner surface (5) of the expanded tubular (1), but does not stick to the relatively hot and smooth expansion member (24).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.