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采用自动法进行了饱和压力拟合、相图计算及拟组分划分,运用权函数及两点上游权法解决了计算中的弥散及稳定性问题,在考虑油气混相程度对相对渗透率和毛管力的影响下,深入研究并建立了多拟组分下三维三相的数学模型。借用sPE4271文中的一例进行了模拟计算,证实了该模型能较好地模拟带底水、油环的凝析气藏的开发过程,该模型与国外同类模型相比,输入参数较少,计算速度较快,拟组分划分比较灵活。同时,对我国华北油田苏桥凝析气田进行了实际模拟,并得出苏桥凝析气田采用干气回注开采时的最佳回注比为60%的结论。
Saturation pressure fitting, phase diagram calculation and quasi-component classification were carried out by automatic method. The weight function and two-point upstream weight method were used to solve the problem of dispersion and stability in calculation. After considering the degree of oil-gas miscibility to relative permeability and capillary Under the influence of force, the mathematical model of three-dimensional three-phase under multi-quasicubjects is deeply studied and established. By using a case of sPE4271, the simulation is carried out to verify that this model can well simulate the development process of condensate gas reservoir with bottom water and oil ring. Compared with similar foreign models, the model has less input parameters and computing speed Faster, quasi-component division more flexible. At the same time, the actual simulation of Suqiao condensate gas field in Huabei Oilfield in our country is carried out. The conclusion is drawn that the optimum reinjection ratio of dry gas injection recovery in Suqiao condensate gas field is 60%.