Curved flapper with angle variant seat for a subsurface safety valve
US6851477B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 2002 |
| Grant date | Feb 8, 2005 |
| Priority date | — |
| Expiry date | Nov 12, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/05
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A subsurface safety valve for controlling fluid flow in a well bore. In one embodiment, the subsurface safety valve includes a tubular member having a longitudinal bore extending therethrough, a curved flapper removably connected to the tubular member. The curved flapper is configured to pivot against the tubular member between an open position and a closed position. The subsurface safety valve further includes a hard seat positioned inside the tubular member, in which the hard seat defines a seating surface configured to receive a sealing surface defined on a bottom periphery portion of the curved flapper to form a sealing interface having a slope that varies along the sealing interface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.