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膨胀试验作为单井吞吐工艺试验的重要评价手段之一 ,在油田注CO2 混相驱试验中已得到应用 ,然而关于注气后原油物性参数的变化规律虽然已作了些研究 ,但目前还不是很清楚 ,文章在对CO2 注气膨胀实验的p—X图、膨胀系数和原始相态参数进行拟合后 ,计算出注气后原油的密度、分子量、泡点处气液相偏差因子和界面张力、原油粘度等的变化规律 ,同时研究了 pV关系和多级脱气的主要特征变化规律。
As one of the important evaluation methods for single well stimulation test, the expansion test has been applied in the CO2 flooding experiments in oilfields. However, although some studies have been made on the variation of physical parameters of crude oil after gas injection, it is not yet very significant Clearly, after fitting the p-X diagram, the expansion coefficient and the original phase parameters of CO2 gas expansion experiment, the density, molecular weight, gas-liquid deviation factor and interfacial tension at gas bubble point , The viscosity of crude oil and so on. At the same time, the main characteristics of pV relationship and multi-stage degassing were studied.