Combination subsurface safety valve and chemical injector valve
US4042033A · kind A · utility
49Cited by
6References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1976 |
| Grant date | Aug 16, 1977 |
| Priority date | — |
| Expiry date | Oct 1, 1996 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A surface controlled subsurface safety valve for controlling fluid flow through a tubing string in an oil or gas well is combined with an injector valve, which is used for injecting a chemical fluid into the tubing string. The pressure exerted by the chemical fluid is used to operate both the injector valve and the subsurface safety valve. The injector valve is designed to open at an injection pressure equal to or greater than the pressure needed to hold the safety valve in its open position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.