1·But, underbalanced drilling technology is not suitable for every reservoir.
但是，欠平衡钻井技术并非适用于所有的油气藏。
2·The stability of viscous foam in dealing with large water invasion and effectively improving solids carrying capacity further promotes the application of underbalanced foam drilling.
粘稠泡沫在对付大量水侵和有效改进岩屑携带能力方面的稳定性，进一步促进了欠平衡泡沫钻井的应用。
3·Based on the theory of elasticity and molar-Coulomb strength failure criterion, we proposed the prediction method for hole enlargement ratio in the condition of underbalanced drilling.
基于弹性力学理论及岩石摩尔-库仑强度破坏准则，提出了欠平衡钻井条件下井径扩大率的预测方法。
4·Finally, it provides the screening process of reservoirs based on the optimizing underbalanced drilling technology.
以优化欠平衡钻井作业为依据，提出了油气藏的筛选步骤。
5·Underbalanced drilling technology can increase ROP and decrease formation damage, so it is increasingly used worldwide.
欠平衡钻井技术可以降低地层损害、提高机械钻速，所以在世界范围内被逐渐采用。