Wellbore system having an annulus safety valve
US11702913B2 · kind B2 · utility
1Cited by
8References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 16, 2021 |
| Grant date | Jul 18, 2023 |
| Priority date | — |
| Expiry date | Sep 25, 2041 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An annulus safety valve assembly for controlling gas flow in a wellbore annulus that includes a passage, a check valve in the passage, and an actuator that is selectively changed between first and second states. The actuator is bi-stable, and requires no energy to remain in either state. When the actuator is put into one of the states, the check valve configuration is changed from one way flow to two way flow. Reconfiguring the check valve into the two way flow configuration vents lift gas from inside the annulus that is below the check valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.