| 摘要 |
<p>A downhole differential flow control valve (50) is provided that utilizes a differential pressure area having one pressure area on which the wellbore pressure (Pw) acts and a second area different from the first area on which pressure (Pt) in the tubing acts. The differential area reduces the load in which a spring (66) is required to exert a closing force in the valve. Thus, a coil spring can be used to improve the closing speeds of the valve.</p> |
