| CPC E21B 34/16 (2013.01) [E21B 34/14 (2013.01)] | 20 Claims |
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1. A safety valve for a wellbore comprising:
a first piston disposed within a safety valve body, the safety valve body having an interior; wherein the first piston forms a first seal with a surface of the interior of the safety valve body; wherein the first piston, the interior of the safety valve body, and the first seal define two chambers within the safety valve; wherein the two chambers are separated by the first seal; wherein a first chamber of the two chambers is a control line pressure chamber and is disposed uphole of the first seal; wherein a second chamber of the two chambers is a fluid compression chamber and is disposed downhole of the first seal; wherein the control line pressure chamber is configured to be pressurized to translate the first piston downhole in an axial direction;
a second piston coupled to the first piston such that the two pistons comprise linked motion; wherein the second piston forms a second seal with a sleeve to seal off an annulus outside of and adjacent to the safety valve; wherein the second piston comprises a biasing mechanism to provide a force to translate the second piston uphole in the axial direction; wherein the safety valve is in a closed configuration when the second piston translates in the uphole direction; wherein the safety valve is in an open configuration when the second piston translates in the downhole direction; wherein the open configuration removes the second seal thereby allowing fluid flow from the annulus to an interior of the first piston;
a fluid volume chamber fluidically connected to the fluid compression chamber of the first piston.
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