钻井施工中，确定一个合理的气体迟到时间、岩屑迟到时间以及准确识别真假新钻地层岩屑至关重要。
In the drilling operation, it is important for determining a rational gas lag time and cutting lag time and for identifying newly drilled cutting accurately.
迟到时间必须准，岩屑和深度才能一致。
The lag time should be accurate so as to ensure cutting consistent with depth.
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