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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,到的旋转防喷器关键设备,技术含量高。

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The minimum underbalance is independent of viscosity and compressibility and of reservoir fluids.It is a function of the formation porosity, permeability and radius of perforation channels.

测试压差不依赖于地层流体粘度和压缩为地层孔隙度、渗透率和射孔孔眼半径的函数。

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