Chemical injection check valve incorporated into a tubing retrievable safety valve
US8016035B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 2004 |
| Grant date | Sep 13, 2011 |
| Priority date | — |
| Expiry date | Dec 5, 2029 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/105
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Disclosed herein is a safety valve with a chemical injection configuration. The device includes a hydraulic fluid pressure operated piston at the housing. The device further includes a flow tube in operable communication with the piston and a chemical injection configuration disposed within the housing. Further disclosed herein is a method of maintaining the operation of a safety valve by injecting chemical fluid through a configuration within the safety valve.Still further disclosed herein is check valve. The check valve includes a seal, a dart having a closed head and sealable against the seal, one or more flutes on the dart, and a spring applying a biasing force to the dart to a sealing position, that force being overcomeable by a fluid pressure acting in a direction opposing the spring force.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.