UBD

Application of pressure drop model of gas/ liquid two-phase flow in UBD drilling

气液两相流压降模型在欠平衡钻井中的应用

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The difference of well control between UBD and conventional drilling;

欠平衡钻井井控与常规钻井井控差异及施工原则；

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Applications and Development of UBD Techniques

欠平衡钻井技术及其应用与发展

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The recent advance of offshore UBD technology includes the development of advanced down hole tools, modularized and minimized design of UBD equipment, emphasis on reservoir analysis and study, and integration of UBD equipment with offshore rig or barge.

海上欠平衡钻井最新进展包括先进的井下工具的开发、设备的模块化与小型化、对油藏分析与研究的高度重视以及工作船与欠平衡钻井设备的一体化。

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Gas drilling fluid is often used in UBD in low pressure formation.

在低压储层进行欠平衡钻井时常选用气体型低密度流体。

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Modeling of lower mantle seismic anisotropy beneath subduction zones.

在subduction带较低的冲积层地震各向异性的模拟.

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This is called a subduction zone.

这被称为俯冲带(subductionzone).

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