油气烃类体系完整P-T相图模拟计算

通过对油气烃类体系相平衡热力学理论模型的分析，建立了以摩尔质量等比例关系和体积等比例关系表示的油气烃类体系完整P—T(压力—温度)相图的模拟计算方法。运用该原理并结合状态方程，模拟计算了典型的凝析油气体系、挥发油气体系和黑油体系的两种表现式的完整P—T相图。所得相图形态可直观地给出不同类型油气相态特征，不仅可为石油工业油气藏类型识别、开发阶段预测以及油气分离工艺设计等提供依据，而且在理论研究上还可用于评价状态方程对不同油气烃类体系的适应程度，检验烃类体系一状态方程模型一流体热力学参数场之间的热力学一致性。

The Complete P-T Phase Diagram Calculation for Hydrocarbon Systems

Based on the analysis of phase equilibrium thermodynamic model for hydrocarbon system,the modeling calculated method for the complete Pressure-Temperature(P-T) phase diagram of oil and gas hydrocarbon system has been set up,which is displayed in geometric proportion of molar mass and volume.Applying this theory in conjunction with equation of state (EOS),two kinds display of P-T diagram are well calculated for typical oil-gas hydrocarbon systems,such as condensed gas,volatilizabe oil system and black oil system,from which we can get the phase properties of various type oil-gas systems.By using the phase diagram,we can not only get the basis for the identify of reservoir type,the prediction of development stages and the design of separated techniques,but also value the fit degree of EOS to various hydrocarbon systems,test the thermodynamic consistency among the hydrocarbon systems,EOS and fluid energetic parameters in the field of theory research.Therefore,the calculation theory has extensive practical significance.