国内欠平衡钻井普遍实施，要用到的旋转防喷器是关键设备，技术含量高。
While underbalance drilling spreads greatly, rotating blowout preventer, as a kind of high technical product, is the crucial equipment to control well pressure.
旋转控制头是负压钻井的一个关键装置，利用它和其它地面设备可实现边喷边钻。
Rotary control head is a key device in underbalanced drilling. Combined with other units, drilling while blowing out can be achieved.
旋转控制头是负压钻井的一个关键装置，利用它和其它地面设备可实现边喷边钻。
Rotary control head is a key device in underbalanced drilling. Combined with other units, drilling while blowing out can be achieved.
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