Control system with collection chamber

Details Control system with collection chamber Control system with collection chamber

E - Fixed Constructions

21

B

E21B 43/12 (2006.01) E21B 33/035 (2006.01) E21B 34/06 (2006.01) E21B 34/10 (2006.01) E21B 47/09 (2006.01) E21B 34/00 (2006.01)

Patent

CA 2175940

The invention relates to a control system for a subsurface safety valve (SSV). A pressure-balance feature is introduced such that the control system com- ponents are unaffected by the depth of placement of the SSV. Through the use of this feature, the standard hydraulic control system used for surface components can also be used for an SSV regardless of its depth of installation. In another feature of the invention, a shuttle valve is provided so that each time the SSV is stroked, a volume of control fluid is purged into the annulus. One embodiment of the shut- tle valve may or may not be sensitive to annulus pressure and employs annulus pressure as an aid to stroking the shuttle valve upon application of surface control pressure to assist in actuation of the SSV, while at the same time providing for a purge of a controlled volume of fluid.

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