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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 ,在油田注气混相与非混相驱试验中已得到应用。目前对不同种类气体注入对原油相态影响国内外虽作了些分析和研究 ,但针对同一种流体究竟那种注入气体较好 ,还研究得不多。首先对CO2 注入时原油膨胀试验和未注气时的常规PVT数据进行模拟后 ,对CO2 、N2 、CH4 和烟道气四种不同的注入气体进行了模拟研究 ,给出了在不同种类气体注入时原油的膨胀系数和泡点压力的影响 ,同时对混合气体的注入进行了分析。分析了各种气体在单井吞吐试验对地层流体的适应性 ,对其优缺点也进行了对比分析。
As one of the important evaluation methods for single-well huff and puff test, the swelling test has been applied in the gas-phase mixing and non-miscible flooding experiments. At present, though some analyzes and studies have been made on the influence of different kinds of gas injection on the phase behavior of crude oil, little research has been done on whether the same kind of fluid is better injected gas. First of all, after simulation of crude oil expansive test and non-gas injection conventional PVT data at CO2 injection, four different injection gases of CO2, N2, CH4 and flue gas were simulated. When the crude oil expansion coefficient and bubble point pressure, while the injection of mixed gases were analyzed. The adaptability of various gases to formation fluid in a single-well huff-and-puff test was analyzed, and their advantages and disadvantages were also analyzed.