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Knowledge of underground safety valve control on the ground
Schlumberger Oilfield Services announced that it has installed three ground-controlled subsurface safety valves downhole below 10,000 ft. In the 522-area Mississippi Canyon in the Gulf of Mexico. This TRC-DH safety valve is a reduced operating pressure valve that can be installed downhole above 10,000 ft. This tubing-retrievable valve provides the same operation through two piston control systems. The two piston control systems are individually connected to the control line and still allow for full valve operation at a much lower liquid pressure than conventional valve designs. Predicting the valve's operating pressure under special applications through a computer program and then properly aerating the entire plant to match the completion equipment to the well environment. Valve working pressure up to 15000psi, but also to ensure the same switching characteristics. They can also be used with intelligent well completion control pipeline software. The valve is normally closed. Hydraulic pressure is applied through the line from the ground control panel through the wellhead to the safety valve to open the valve. Piston rod downward movement produces hydraulic pressure, squeeze the power spring, open the valve. This dual control circuit can be used not only simultaneously but also independently of the valve opening and closing pressure. The pressure to open and close is a separate part of the line pressure and the valve must be operated only by overcoming the force of the power spring. When the hydraulic pressure is released, the energy of the shut-off valve comes from the power spring of each piston system and a separate pneumatic spring. Because of the flow tube above, the flap torsion spring moves the flap into the flowing liquid to close in the well. More Keyword Search: Safety Valve