UBD

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.

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

This is called a subduction zone.

这被称为俯冲带(subductionzone).

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；

Applications and Development of UBD Techniques

欠平衡钻井技术及其应用与发展

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。