Pressure equalizing a ball valve through an upper seal bypass
US8336628B2 · kind B2 · utility
2Cited by
53References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 20, 2009 |
| Grant date | Dec 25, 2012 |
| Priority date | — |
| Expiry date | Jan 8, 2031 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A pressure equalizing system allows flow past an upper seal on a movable member downhole that in turn allows pressure to be delivered from uphole into what had previously been an isolated low pressure zone. The pressure differential across the member is equalized before attempting to move the member into another position. The member is a ball in a ball valve for subterranean use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.