Insulation device for a well
US10060222B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 9, 2015 |
| Grant date | Aug 28, 2018 |
| Priority date | — |
| Expiry date | Jan 9, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/14
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The invention relates to an insulation device for wells by controlled supply of the internal volume of an expandable sleeve placed on a casing, comprising a non-return valve placed in a passage which connects the internal volumes of the casing and of the sleeve and a three-way valve which switches a single time between an initial state in which a link connects the internal volumes of the casing and of the sleeve to expand the sleeve and a final state in which the link between the internal volumes of the casing and of the sleeve is interrupted, whereas a link is set up between the internal volume of the sleeve and an annular volume of the well, the three-way valve and the non-return valve forming, after switching, two non-return valves mounted in series and in opposite directions on the passage connecting the internal volumes of the casing and of the sleeve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.