| 摘要 |
The present invention provides a fluid flow control device for controlling the formation fluid flow rates through a production string. The device includes a generally tubular body for placement into the wellbore. The tubular body has a screen at an outer surface for preventing sand from entering into tabular body. The fluid flowing through the screen passes through a labyrinth. A slidable sleeve on the labyrinth controls the fluid velocity there through. The slidable sleeve screen is moved by an electrically-operated device, such as a motor paced in the production string. The fluid leaving the labyrinth passes to a tubing in the tubular body for carrying the fluid to the surface. The flow control device further may include a control circuit in the production string for controlling the operation of the electrically-operated device. The control circuit may communicate with the a surface control unit, preferably a computer-based system, which may provide commands to the downhole control circuit for causing the electrically-operated device to adjust the position of the sleeve. The sleeve may be positioned at any place on the labyrinth, providing accurate control over the flow rate. The surface control unit may communicate with the downhole control circuit via a data communication link, which may be a cable or a trans/receiver system.
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