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针对我国发现的CO2和N2含量相对较高的无机成因气藏的特征,选取有代表性的非烃类流体进行PVT分析,得到了p—Z关系,并以VB语言和所选取的计算模型为基础,编制了相应的计算程序。对典型的临界参数的校正模型与用密度计算的临界参数模型的不同组合的平均偏差、文献中广泛推荐的DAK8、DAK11、Hall-Yarborough方法与笔者推荐的方法在计算此类流体的偏差系数时的平均偏差进行了比较。与实验数据进行对比后认为:对于该类气藏在计算临界参数时,除了考虑CO2的影响外,还不能忽视N2的影响。所推荐的方法在计算高含CO2气藏流体的偏差系数时有一定的优势。
According to the characteristics of inorganic gas reservoirs discovered in our country with relatively high contents of CO2 and N2, a representative non-hydrocarbon fluid was chosen for PVT analysis, and the p-Z relationship was obtained. Based on the VB language and the selected calculation model, Basis, compiled the corresponding calculation procedures. The average deviation of different combinations of the calibration model of typical critical parameters and the critical parameter model calculated by density, DAK8, DAK11 and Hall-Yarborough methods widely recommended in the literature and the method recommended by the author when calculating the deviation coefficient of such fluids The average deviation was compared. Comparing with the experimental data, it is concluded that the influence of N2 can not be ignored except for the influence of CO2 when calculating the critical parameters for this type of gas reservoir. The proposed method has some advantages in calculating the coefficient of variation of high-CO2 gas reservoir fluids.