Multi-line back pressure control system
US6659184B1 · kind B1 · utility
29Cited by
4References
44Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 15, 1998 |
| Grant date | Dec 9, 2003 |
| Priority date | — |
| Expiry date | Dec 27, 2018 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/10
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A multi-line back pressure control system for providing two way hydraulic line movement while maintaining back pressure control. Check valves are integrated in hydraulic fluid control lines extending downhole into a wellbore. Each check valve is pilot operated with pressure from another hydraulic line to selectively open the lines for two way fluid communication. Removal of the pilot pressure closes the check valves to provide passive back pressure control against catastrophic wellbore events. Pilot pressure operation between multiple pressurized lines can be provided with valves such as three-way, three-position piloted valves.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.