因此，多年来钻井界一直在研究盐膏层的安全钻井问题。

So, safety of drilling in the salt layer is concern in the drilling field many years.

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井下钻具的工作安全性是安全钻井施工的重要技术指标。

Drilling tool's working security is one of the important technical target of safety drilling.

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实时定量的监测气侵，一直是安全钻井特别是气井作业的重要课题。

It is important to detect and measure gas cutting at real time and quantitatively, specially during gas well production.

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