完成了球塞气举试验装置的结构和控制系统设计。
This paper describes the design of the Pig lifting structure and its control system.
ESP的导流罩提供了一个液相的流动空间，即使当天然气在井筒中形成气塞时，仍可保证ESP系统的持续正常工作。
The shroud provides a reservoir of fluid that allows the ESP system to continue operating when gas slugs displace fluid in the wellbore.
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