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本文根据溶解度参数规则，将石油烃类体系划分为六个拟二元体系的组合，在此基础上，建立了一种新的收敛压力求解方法。并依据Grayson-streed规则和临界指数理论推证了一种具有一定理论基础的分段求解平衡常数的新方法，然后应用此方法编制了具有收敛压力、平衡常数、露点、泡点、闪蒸计算等五种功能的计算软件，并进行了两个实际油气体系的平衡常数和W72井的相态计算。结果表明，这种方法切实可行。

Phase State Calculation of Oil and Gas System Using a New Solving Pro-cess of Convergence Pressure and Equilibrium Constant

In the light of the rule of solubility parameter, the petroleum hydrocarbon system is divided into six compositions of quasi-binary system. Based on this, a new solving process of convergence pressure is set up. According to Grayson-streed rule and the theory of critical index, a new method of sectionally solving equilibrium constant with a certain theory basis is deduced. Then, using this method, a computing solfware with five functions containing the calculations of convergence pressure, equilibrium constant, dew point, bubble point, flash vaporization etc. is draw up and the equilibrium constants of two practical oil and gas systems and the phase state of well w72 are calculated. The results indicate that this method is feasible in practice.