Surface controlled subsurface safety valve
US4834183A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1988 |
| Grant date | May 30, 1989 |
| Priority date | — |
| Expiry date | Feb 16, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/05
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A surface controlled subsurface safety valve for use in a well tubing string including a valve closure member, an operator tube for opening the valve closure member, an annular piston on the operator tube responsive to control fluid pressure conducted from the well surface, and a spring biasing the operator tube to a position closing the valve. A lockout sleeve mounted in tandem with the operator tube for movement to a position in which the lockout sleeve holds the valve open. The operator tube having multiple flow paths and barriers to prevent accumulation of debris from well fluids within the safety valve. One flow path including a plurality of small ports extending through the upper portion of the operator tube. Another flow path defined in part by a reduced outside diameter portion of the operator tube near its lower end and multiple channels in the valve housing adjacent thereto.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.