Inflatable packer assembly with control valve
US4260164A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 1979 |
| Grant date | Apr 7, 1981 |
| Priority date | — |
| Expiry date | Jun 15, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87917
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An inflatable packer assembly includes a cylindrical mandrel with a cylindrical valve body concentrically disposed about the mandrel. The valve body includes an inlet communicating with an interior of the mandrel and an outlet for directing fluid to an inflatable element of the packer assembly. First and second axial bores, containing first and second pistons, respectively, are disposed in said valve body and communicate with an end surface thereof. The first bore also communicates with said inlet. A first port connects the first and second bores. A second port connects the second bore and the outlet. The first piston is held in a first position blocking said first port until a pressure differential across the first piston reaches a first level at which the first piston is released and is moved to a second position allowing fluid communication between the inlet and the first port. The second piston is held in a first position allowing fluid communication between said first and second ports until a pressure differential across said second piston reaches a second level, higher than said first level, at which said second piston is released and is moved to a second position blocking sa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.