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利用长细管模型的油气混相驱替试验考察了油藏油性质、油藏温度和注入气的组成对 CO_2 最小混相压力的影响。结果表明:油藏油中可供注入气萃取的轻至中等烃组份的含量是决定动力学混相难易的直接原因;注气压力是形成油气混相驱替的必要条件;温度升高,所要求的最小混相压力增加;降低 CO_2气中的甲烷含量,可降低最小混相压力。基于上述因素的分析,本文提出预测最小混相压力的经验关系式,与国外目前已提出的预测最小混相压力方法的对比表明,本文得出的经验式具有一定的适用性。
The effects of reservoir oil properties, reservoir temperature and composition of injected gas on the minimum mixed phase pressure of CO_2 were investigated by using the oil and gas miscible displacement test of the slender tube model. The results show that the content of light to medium hydrocarbon components in reservoir oil which can be extracted by injection gas is the direct reason to determine the difficulty of kinetic miscibility. Gas injection pressure is the necessary condition to form oil-gas mixture flooding. When the temperature rises, The minimum required miscibility pressure increases; reducing the methane content of the CO_2 gas reduces the minimum miscibility pressure. Based on the analysis of the above factors, this paper puts forward an empirical relationship between the predicted minimum miscibility pressure and the proposed method for predicting the minimum miscibility pressure in foreign countries. The comparison shows that the empirical formula obtained in this paper has some applicability.