Method of controlling a subsurface safety valve
US6491106B1 · kind B1 · utility
21Cited by
15References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 14, 2001 |
| Grant date | Dec 10, 2002 |
| Priority date | — |
| Expiry date | Mar 14, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B18/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method is provided for controlling operation of a subsurface hydraulically operated well tool. In a described embodiment, a surface controlled subsurface safety valve is controlled utilizing two control lines. The control lines are hydraulically connected to respective ones of two pistons in the safety valve. Pressure applied to either of the two pistons is capable of independently operating the safety valve. In normal operation, pressure is applied to both of the pistons. However, when a failure occurs in one of the control lines, the other may still be used to operate the safety valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.