Underbalanced drilling technology can increase ROP and decrease formation damage, so it is increasingly used worldwide.

欠平衡钻井技术可以降低地层损害、提高机械钻速，所以在世界范围内被逐渐采用。

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But, underbalanced drilling technology is not suitable for every reservoir.

但是，欠平衡钻井技术并非适用于所有的油气藏。

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To economically and efficiently develop the gas field, Wells were drilled using underbalanced drilling and slim-hole drilling technology.

根据高效低成本开发苏里格气田的要求，进行了欠平衡及小井眼钻井，为低成本开发苏里格气田做前期技术准备。

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