Patent ID: 9494015
Filing Date: 2016-11-15
CPC Classification: E21B

Claim Text:
1. A dual closure system configured for being disposed in a wellbore through a fluid-producing formation, the dual closure system comprising: a subsurface safety valve comprising a body having an active closure mechanism configured to be positioned in a passageway defined by a tubing string, the subsurface safety valve being coupleable to a control line; and a passive closure mechanism coupleable to the tubing string such that the passive closure mechanism is physically separated from the control line by the body of the subsurface safety valve, wherein the passive closure mechanism is configured to be in a closed position that prevents a flow of fluid to a portion of the passageway that is closer to a surface of the wellbore than the passive closure mechanism in the absence of the subsurface safety valve in the tubing string, and wherein the subsurface safety valve is configured to be positioned in the passageway of the tubing string such that the subsurface safety valve causes the passive closure mechanism to be in an open position that allows the flow of fluid to a second portion of the passageway that is closer to the surface of the wellbore than the passive closure mechanism.