Flapper mounted equalizer valve for subsurface safety valves
US8056618B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2007 |
| Grant date | Nov 15, 2011 |
| Priority date | — |
| Expiry date | Jun 24, 2028 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/05
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An equalizing valve for a flapper in a subsurface safety valve has a valve member disposed in a passage in the flapper that is made of a material that changes shape when subjected to a stimulus such as heat, for example. In one configuration, the valve member closes off the passage and in another flow past or through the valve member defines the open position allowing pressure to equalize across the closed flapper. Other valve applications are envisioned for downhole use. The stimulus can come from applied electrical current that causes sufficient heating to have the valve member alter its shape. Mechanical assists to the shape altering can be provided which can also optionally be made of shape changing materials. Biasing into a sealed position is envisioned.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.