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    • 8. 发明授权
    • Chemical injection valve
    • 化学注射阀
    • US5004007A
    • 1991-04-02
    • US330680
    • 1989-03-30
    • Dale V. JohnsonJohn R. Gordon
    • Dale V. JohnsonJohn R. Gordon
    • E21B34/06E21B34/10
    • E21B34/06E21B34/105Y10T137/2934Y10T137/7788
    • An improved surface controlled chemical injection valve and method for injecting chemical fluid into the bore of a tubing string of a well are provided, the chemical injection valve having at least one piston movable in response to the pressure of the chemical fluid, an actuator connected to the piston, and a flow restrictor wherein the pressure of the chemical fluid supplied to the valve from the chemical fluid source acts on the piston to cause the actuator to open the valve and inject the chemical fluid into the tubing string bore. The flow restrictor is mounted downstream of the piston to create sufficient available pressure in the chemical fluid upstream of the flow restrictor to act on the piston and hold the valve in the open position.
    • 提供了一种改进的表面控制化学喷射阀和将化学流体喷射到井的管柱的孔中的方法,所述化学喷射阀具有至少一个可响应于化学流体的压力而移动的活塞,致动器连接到 活塞和限流器,其中从化学流体源供应到阀的化学流体的压力作用在活塞上,以使致动器打开阀并将化学流体注入管柱孔中。 限流器安装在活塞的下游,以在限流器上游的化学流体中产生足够的可用压力,以作用在活塞上并将阀保持在打开位置。