Subsurface safety valve

Details Subsurface safety valve Subsurface safety valve

F - Mech Eng,Light,Heat,Weapons

16

K

137/34

F16K 11/00 (2006.01) E21B 34/10 (2006.01) E21B 34/00 (2006.01)

Patent

CA 1076452

SUBSURFACE SAFETY VALVE Abstract of the Disclosure A surface controlled subsurface safety valve having a main valve and an equalizing valve. The equalizing valve is opened prior to the opening of the main valve. An extra control pressure force is provided to open the equalizing valve against the resistive force present due to high shut-in formation pressures. On the other hand, the safety valve can close when low subsurface pressure conditions exist at the valve. This abstract is neither intended to define the scope of the inven- tion, which, of course, is measured by the claims, nor is it intended to be limiting in any way.

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