Air drilling is a kind of under-balanced drilling technology with air, whose rock breaking form is different from conventional mud drilling.

空气钻井技术是以空气作为循环介质的欠平衡钻井技术，其钻头的破岩形式与常规泥浆钻井有很大的区别。

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Calculation results show that they accurately reveal the distribution pattern of pressure in wellbore during under-balanced drilling operation.

计算结果表明，该套公式较为精确地模拟了欠平衡钻井过程中井眼压力分布的规律。

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Well WP-1 is the first medium radius horizontal well drilled in Jianghan oilfield, and its horizontal interval is drilled using under-balanced technology.

王平1井是江汉油田的第一口中曲率水平井，储层岩性为盐间非砂岩层，水平井段采用欠平衡钻井技术。

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And the point was to force Congress to choose the less onerous alternative of reducing the deficit and getting our long-term debt under control in a balanced way.

WHITEHOUSE: Press Briefing

As director of the Office of Management and Budget under President Clinton, Lew helped to negotiate the deal that balanced the federal budget -- and led to a budget surplus.

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