Advantages of a new nozzle valve for gas lift
Two types of gas-lift valves are used. In the first type, there is a mechanism to open or close the valve, according to pressure and/or temperature conditions in the well. A charged bellows is the most common mechanism. The second type is valves that are always open (in the casing-to-tubing direction). These valves employ a choke to restrict flowrate and a check valve to avoid reverse flow from tubing to casing. The most commonly used choke is a cylindrical plate with a square-edge orifice. Alternatively, a choke with Venturi geometry may be used. These valves are commonly called orifice or Venturi (or Venturi-nozzle) valves. Typically, the charged bellows type is used as discharge valves, while the operating valves are of the orifice or Venturi type.
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