地层油气的相平衡热力学研究

THERMODYNAMICS OF MULTI-PHASE EQUILIBRIUM FOR RESERVOIR FLUID SYSTEMS

地层油气的相平衡热力学研究王利生（北京理工大学化工学院北京１０００８１）关键词混合规则，状态方程，油藏流体，相平衡１链状分子的普遍化范德华配分函数链状分子的转动和振动运动会受阻于其它分子的运动，因而其配分函数中的转动和振动贡献与温度、密度均有关，被分...

Based on the lattice gas theory, a new coordination number model and an expressionof configuration energy for mixture consisting of square-well molecules are developed. Thecalculation results based on the new models agree well with the Monte Carlo computersimulation data of Lee et al. By extending the new coordination number and configurationenergy models to chainlike molecules, and substituting into the integration formula of meanpotential in the modified generalized van der Waals partition function for mixture of chainlikemolecules, corresponding mixing rule for energy parameter in the simplified perturbed hardchain equation of state are derived. A cubic simplified perturbed hard chain equation ofstate has been applied with the new mixing rule and better prediction have been achievedfor the multi-phase equilibrium for reservoir fluid systems.