Safety valve, method, and system

Abstract

An insert safety valve, including a housing, a flow tube in the housing, a flapper responsive to positions of the flow tube, an atmospheric chamber in the housing, an element upon the housing, a selectively openable arrangement to prevent or allow pressure communication between the chamber and an environment outside the housing, the arrangement including an opener responsive to movement of the element to selectively open the openable arrangement. A borehole system, including a preexisting downhole structure having a control line, an insert safety valve, in the preexisting downhole structure, the insert safety valve operable with the control line. A method for controlling a wellbore, including running an insert safety valve while preventing fluid communication with an atmospheric chamber of the safety valve, moving the opener, and enabling fluid communication with the atmospheric chamber.

Dependencies are inferred from the claim text.