Unloading injection control valve
US4552218A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1983 |
| Grant date | Nov 12, 1985 |
| Priority date | — |
| Expiry date | Sep 26, 2003 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A valving apparatus for use in controlling the fluid pressure in a subterranean well conduit and in the annulus surrounding the conduit is disclosed. The valving apparatus is shiftable between a closed position and an open position allowing flow within the tubing by the application of fluid pressure in the tubing above the valve. Pressure equalization below the valve is provided when the valve is in the closed position thus permitting the tool to be used with well tools in which annulus and tubing pressure must be equalized. A plug located within the valve prevents the flow of fluids through the conduit in either direction. An annular fluid bypass does permit flow around the plug when the valve is in the open position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.