Flapper mounted equalizer valve for subsurface safety valves

Details Flapper mounted equalizer valve for subsurface safety valves Flapper mounted equalizer valve for subsurface safety valves

2007-07-18

2011-11-15

Bagnell, David (Department: 3676)

Wells

With heating, refrigerating or heat insulating means

C166S066600, C166S324000, C166S332800

Reexamination Certificate

active

08056618

ABSTRACT:
An equalizing valve for a flapper in a subsurface safety valve has a valve member disposed in a passage in the flapper that is made of a material that changes shape when subjected to a stimulus such as heat, for example. In one configuration, the valve member closes off the passage and in another flow past or through the valve member defines the open position allowing pressure to equalize across the closed flapper. Other valve applications are envisioned for downhole use. The stimulus can come from applied electrical current that causes sufficient heating to have the valve member alter its shape. Mechanical assists to the shape altering can be provided which can also optionally be made of shape changing materials. Biasing into a sealed position is envisioned.

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