unbalance drilling的用法和样例：
例句
- Underbalanced drilling increases deliverability form gas storage wells.
采用欠平衡钻井增加油气贮备井的开采量。 - In light of the geological features of reservoirs in Changqing Gas Field, the study and test of gas underbalance pressure drilling technology have been carried out in the field.
摘要针对长庆气田储层地质特征，开展了长庆气田天然气欠平衡钻井技术研究及试验。
