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Introduction: the well fluid downhole safety valve is abnormal flow control device. The valve has a self-balancing structure, flow control, such as the occurrence of irresistible natural disasters, emergencies can automatically shut down, to achieve the well fluid. Erosion resistant material self-balancing system that can guarantee to provide security in the event of failure, little effect on the integrity and reliability of the safety valve. How it works: I produced the tubing retrievable safety valve disc type hydraulic control lines to rely on, by spring force, hydraulic pressure, the spring pressure to open and close. Using disc structure, through the ground pressure, hydraulic oil through hydraulic pressure was transmitted to the Control Manager line to the piston bore, and compression springs push the piston moves down, the flapper valve or ball valve opens, if pilot pressure remains safe valve is open, the Control Manager release liquid line pressure by spring tension pushing the piston moves upward, the valve plate or the valve ball is turned off. Disc valve flow area is a full size, a larger flow rate can be obtained, suitable for high production oil and gas well. |