So choosing correct underbalance pressure differential is key factor for underbalance perforation design.
选取合适的负压值是负压设计的关键。
While underbalance drilling spreads greatly, rotating blowout preventer, as a kind of high technical product, is the crucial equipment to control well pressure.
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.
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。
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