| 摘要 |
<p>A control system (50) is provided for controlling the flow of hydrocarbons out of a production well. The control system has a primary control circuit which is wholly hydraulic and a secondary control circuit which is wholly electrical. Hydraulic (64) and electrical (66) actuators associated respectively with the primary and secondary control circuits control the operation of chokes (60 and 62) located in the well.</p> |
