In this paper, three respects are studied, including empirical equation, lab test and numerical model. The method to calculate the minimum miscible phase pressure of the CO_2 miscible drive is analyzed. 文章从经验公式计算、室内实验和数值模拟三个方面进行了研究,分析论证了确定CO2混相驱最小混相压力的方法;
The CO_2 miscible drive is the third production technique to enhance oil recovery for the low permeability reservoir. The minimum miscible phase pressure of the CO_2 miscible drive is the key of the study. CO2混相驱是低渗透油藏提高采收率的三次采油技术,而CO2混相驱最小混相压力是研究的关键。
Determination of minimum miscible phase pressure for CO_2 miscible drive CO2混相驱最小混相压力确定方法研究
The influences of gas injection pressure in the miscible gas drive are notably weakened. 在混相驱中,注入压力的影响较小。图6表2参6。
Displacement characteristics of long cores show that it is a near miscible system that the recovery efficiency is higher 38.43% and 22.08% than that of nitrogen drive and water drive at the same conditions. 长岩心驱替特征则表明该体系是一个近混相体系,与相同条件下的氮气驱和水驱相比,采收率分别提高了38.43%和22.08%;
Through CO2 miscible drive experiment, a series of parameters such as recovery efficiency 、 oil/ gas exchange ratio 、 gas-oil ratio and gas-injection ability are obtained under various kinds of pressure. 通过进行CO2混相驱替实验,测定了不同压力下CO2驱的采收率、气体突破时间、换油率、生产气油比、注气能力等参数。