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.
板 防喷器是石油钻井过程中的一种重要设备。
Ram-type blowout preventer is important equipment used in oil drilling operation.
闸板防喷器关井速度快、耐高压，是二级井控最重要的设备。
The ram BOP is the most important equipment for secondary well control, quick to shut in the well, and of a high pressure rating.
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