unbalanced drilling的用法和樣例：
例句
- Underbalanced drilling increases deliverability form gas storage wells.
採用欠平衡鑽井增加油氣貯備井的開採量。 - 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.
摘要針對長慶氣田儲層地質特徵，開展了長慶氣田天然氣欠平衡鑽井技術研究及試驗。
