当抽油井的环形空间中出现泡沫段时，将会失去明显的油-气界面。
When there is a foam column is the annular space of a pumping oil well there will be no distinct gas-oil interface.
正确识别含油气构造中的油、气、水分界面一直是含油气构造评价的一个关键问题。
It is a key question that exactitude recognition of interface between gas and oil and between oil and water in the oily construction.
可以进行多次压力测试以建立地层压力梯度，从而判断油、气、水界面。
Multiple tests can be performed to measure formation pressure, and the formation pressure gradient can be established, accordingly, interface between oil, gas and water can be identified.
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