Expanding piston for a subsurface safety valve
US9982510B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 11, 2013 |
| Grant date | May 29, 2018 |
| Priority date | — |
| Expiry date | Apr 5, 2036 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/05
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Disclosed are subsurface safety valves having an expanding piston used to increase the opening force for the safety valve. One disclosed safety valve includes a housing having a piston bore defined therein and configured to receive hydraulic fluid pressure, the piston bore providing a tapered portion having a first end and a second end, wherein a cross-sectional diameter of the tapered portion progressively increases from the first end to the second end, and a piston assembly movably arranged within the piston bore and comprising a piston rod that extends longitudinally within at least a portion of the piston bore and an expanding piston coupled to the piston rod, wherein the expanding piston is configured to move between a contracted configuration and an expanded configuration to sealingly engage the tapered portion as the piston assembly moves between the first and second ends.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.