常规过平衡钻井方式打开油气层时，井底压力高于地层压力，钻井流体会向地层渗滤甚至漏失。
In routine overbalanced drilling, the bottom hole pressure towers above the formation pressure so that the mud fluid will leak into the formation.
虽然平衡钻井越来越受到勘探工作的重视，但吉林伊通探区因独特而复杂的地质条件，仍以过平衡钻井为主。
Although balance drilling is paid more attention to, Yitong exploration area in Jilin is still put overbalance drilling first for its unique and complex geological conditions.
由于地层流体不能进入井筒，过平衡钻井时要确定油气层一般都通过岩屑录井、气测录井、岩心分析、荧光等来实现。
Because the formation fluid can not seep in well bore, people find out reservoir usually by cuttings logging, gasometry logging, core analysis, fluorescence etc.
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