Claims
- 1. A method of operating a subsurface safety valve in a well having a single pressure responsive surface for operating the valve to the open position for enabling flow including the steps of:
- pressurizing a first control fluid conduit communicating with the pressure responsive surface from exteriorly of the well for operating the valve; and
- pressurizing a second control fluid conduit communicating with the pressure responsive surface from exteriorly of the well for operating the valve in the event of a malfunction of the first control fluid conduit.
- 2. The method as set forth in claim 1, including the step of:
- changing the sealing of the second control fluid conduit to block communication with the pressure responsive surface while enabling communication with the well fluid passageway.
Parent Case Info
This application is a divisional of application Ser. No. 593,333, filed Oct. 5, 1983 now abandoned.
US Referenced Citations (3)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2121090 |
Dec 1983 |
GBX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
593333 |
Oct 1983 |
|