Underwater baseplate installation in advance is needed for semi - submersible platform pre - drilling well.

半潜式平台预钻井,需要预先安装水下基盘.

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We obtained some experiences by drilling well from ground test.

地面钻井开发通过在各矿区的试验,取得了一定的开发经验.

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The oil explorers are drilling well.

石油勘探者们正在打井.

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