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.
对提高我国旋转防喷器的综合技术水平方面具有一定的理论意义和应用参考。
It provides the important theory meaning and application references in comprehensive technology level of the domestic RBOP.
研制旋转防喷器有几大难点，主要集中在密封胶芯、旋转动密封及轴承，各自的寿命满足实际应用是保证钻井施工安全的关键。
There are many difficulties during the new rotating blowout preventer's manufacture and test, they concentrate on spherical seal, dynamic seal and bearings.
研制旋转防喷器有几大难点，主要集中在密封胶芯、旋转动密封及轴承，各自的寿命满足实际应用是保证钻井施工安全的关键。
There are many difficulties during the new rotating blowout preventer's manufacture and test, they concentrate on spherical seal, dynamic seal and bearings.
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