Balance line safety valve with tubing pressure assist

Details Balance line safety valve with tubing pressure assist Balance line safety valve with tubing pressure assist

2008-07-01

2008-07-01

Gay, Jennifer H (Department: 3676)

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

C166S386000, C166S324000, C166S332800

Reexamination Certificate

active

07392849

ABSTRACT:
The present invention generally relates to a subsurface safety valve configured to control fluid flow through a production tubing string. In one aspect, a safety valve for deployment beneath a surface of a wellbore is provided. The valve includes a control piston and a balance piston. The valve is configured to be connected to a controller at the surface by a control line so that the control piston is actuatable between a first position and a second position in response to receiving pressurized fluid from the controller through the control line. The balance piston is configured to compensate for hydrostatic pressure in the control line. The valve may have a bore therethrough and the control piston may be configured to utilize tubing pressure within the valve bore to urge the control piston towards the second position.

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