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根据大庆榆树林油田原油组分变化、CO2与原油界面张力关系及CO2超临界性质,对CO2混相驱地层情况进行了模拟研究,建立了CO2混相驱驱替模型和方程。研究结果表明,超临界状态的CO2可以降低所波及油水的界面张力;混相时混相带原油含碳组分中C20以下的含量达到了最高值;水气交替注入时,水对混相有不利的影响。
According to the changes of crude oil composition, the interfacial tension between CO2 and crude oil and the supercritical carbon dioxide in the Yushulin Oilfield of Daqing, the formation of CO2 mixed flooding strata was simulated and the model and equation of CO2 mixed flooding displacement were established. The results show that the supercritical CO2 can reduce the interfacial tension between oil and water, and the content of carbon under the C20 reaches the highest in the miscible phase. In the case of alternate injection of water and gas, the water has an adverse effect on the miscible phase .