改进的CO2驱相对渗透率模型及其应用

摘要

An improved multi-phase relative permeability model for C02 flooding wag presented based on the Corey model by considering the interaction of CO2 and oil and its effect on oil displacement efficiency. By combining the gas-liquid relative permeability index with the displacement pressure or present reservoir pressure, the influences of CO2-oil interaction on phase behavior, flow pattern and oil recovery factor were researched. The model was used to simulate different C02 injection processes in a low permeability reservoir. Tne results show that the improved model can increase the precision of reservoir simulation , especially suitable for the process of near-nuscible CO2 flooding. Good simulation results for both laboratory experiments and field prediction were obtained.%在现有相渗模型的基础上,考虑CO2与原油的相互作用,提出一种改进的CO2驱多相相对渗透率模型,采用气液相渗指数与驱替压力或当前油藏压力相关联的方法,研究CO2与原油间的相互作用对相态、流态和原油采收率的影响.利用改进的相渗模型对室内试验和现场CO2驱的效果进行数模拟合和验证.结果表明,改进的CO2驱相渗模型提高了油藏数值模拟的精度,特别适用于CO2近混相驱过程,室内试验和现场CO2驱的拟合效果较好.