以下为句子列表：
英文: If pre-drilling mode was taken in an offshore oil development, PGB-free well drilling technology might be adopted for supplementary wells when the PGB slots were totally occupied.
中文: 摘要采用预钻井方式开发的海上油气田，对水下钻井基盘钻井槽孔用完后增钻的调整井，可采用无基盘钻井方式作业。
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