The Tubing Vent Valve (TVV) is made up in the tubing string at a depth that allows the gas vent feature which is controlled via a control line to surface to be “fail-safe” and provide adequate shut-in of gas in the event that hydraulic capability is compromised.
In deep set applications it is not possible to use a standard gas vent valve (piston or sleeve type) due to the setting depth limitation so the TVV was developed to address this by removing the gas venting capability to a more shallor point in the tubing string. Communication of gas from below the packer, passed through a 3/8” or larger control line or line pipe from the packer body to the TVV mounted at shallow depth in the well bore above the packer and is a hydraulically operated type valve designed to vent the volume of gas built up below the packer in Electrical Submersible Pump applications. This allows the Electrical Submersible Pump to run in optimum conditions, increasing run life and maintaining well production.
The valve, constructed inside the TVV, is opened by applying positive hydraulic pressure through a control line from the surface and closes when the pressure is removed.
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