The gas release valve is installed on top of the hydraulic retrievable packer and connected with thread. The gas release valve is hydraulically controlled, non-equalizing, and allows gas to pass through the connected packer. The gas release valve can discharge the gas below the packer into the upper annulus. The valve of the gas release valve can be opened by applying pressure through the hydraulic control line, and can be closed by releasing pressure. After the control line releases the pressure, the spring force acts on the piston and pushes the valve to the closed position. During operation, the control line must be firmly fixed on the tubing, with at least two fixed on each joint. If hung on one side of the hanger while traveling through the downhole tubing, the control line must tur

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