Pressure balanced piston for subsurface safety valves

Details Pressure balanced piston for subsurface safety valves Pressure balanced piston for subsurface safety valves

2008-01-24

2010-06-29

Neuder, William P (Department: 3676)

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

C166S332800, C166S386000

Reexamination Certificate

active

07743833

ABSTRACT:
A control system for a subsurface safety valve references the surrounding annulus to put the operating piston in pressure balance. Depending on the configuration and which seal in the system fails, the various embodiments can differ in their failure modes. With the lower end of the piston exposed to annulus pressure all failure modes close the flapper. With the lower end of the piston exposed to tubing pressure, failure of any of the seals except one will result in flapper closure.

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Calhoun, M.B., et al., “Subsurface Safety Systems for TLP Completions”, SPE 12296, Oct. 1984, 8 pages.
Hill, T.H., et al., “A New Completion System for Surface-Controlled Subsurface Safety Valves” Journal of Petroleum Technology, Mar. 1974, 331-336.
Morsi, K.M., “Surface and Downhole Production Safety Systems for Sour Oil and Gas Wells”, SPE 13743, Mar. 1985, 10 pages.
Bussear, Terry, et al., “Design and Qualification of a Remotely-Operated, Downhole Flow Control System for High-Rate Water Injection in Deepwater”, SPE 88563, Oct. 2004, 1-8.

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