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针对三元复合驱过程中化学反应的特点及我国油田地层的实际情况 ,通过合理简化 ,在分清主要反应和次要反应的基础上 ,提出了新的化学反应平衡物理模型和数学模型 ,并运用新模型进行了实验室岩心驱替的数值模拟。与国外化学驱软件UTCHEM的计算结果对比 ,该模型的计算速度及稳定性有所提高 ,并有一致或相似的规律。针对我国油田地层水中镁离子含量少的特点 ,利用新模型讨论了地层水中镁离子对化学反应平衡及驱油效果的影响 ,分析了碱耗的原因 ,提出在实际油田数值模拟过程中 ,当镁离子浓度比钙离子浓度低一个或一个以上数量级时 ,可以不考虑镁离子的相关反应 ,这样既能提高运算速度又能保证计算精度。
Aiming at the characteristics of chemical reaction during ASP flooding and the actual situation of oilfield strata in our country, a new chemical reaction equilibrium physical model and mathematical model are put forward based on the rational simplification. On the basis of distinguishing the main reaction and the secondary reaction, The new model is a numerical simulation of laboratory core flooding. Comparing with the calculation result of UTCHEM, the computational speed and stability of this model are consistent and similar. Aiming at the characteristics of low content of magnesium ion in formation water of our country, this paper discussed the effect of magnesium ion in formation water on the chemical reaction equilibrium and oil displacement effect. The reason of alkali consumption was analyzed. In the numerical simulation of actual oil field, When the concentration of ions is one or more orders of magnitude lower than the concentration of calcium ion, the related reaction of magnesium ions can be ignored, which not only improves the calculation speed but also ensures the calculation accuracy.