Gibbs自由能最小化法计算二氧化碳-烃-水系统相平衡

doi:10.7623/syxb201505008

CORC > 北京大学 > 工学院

	Gibbs自由能最小化法计算二氧化碳-烃-水系统相平衡; Phase equilibrium calculation of CO2-hydrocarbons-water system based on Gibbs free energy minimization
	邸元 ; 张园 ; Wu Yu-Shu
刊名	石油学报
	2015
关键词	相平衡 Gibbs自由能最小化平衡常数多组分混合物二氧化碳 phase equilibrium Gibbs free energy minimization equilibrium constant multi-component mixture carbon dioxide
DOI	10.7623/syxb201505008
英文摘要	油-气-水三相的相平衡计算是二氧化碳驱物性参数分析及数值模拟研究的核心问题之一.Gibbs自由能最小化法基于相平衡的热力学理论,适应性广、计算稳定,比较适合二氧化碳烃-水系统的相平衡计算.通过引入相稳定性变量,采用拉格朗日乘数法计算多相多组分系统Gibbs自由能的最小化问题,由Newton-Raphson迭代法求解相应的控制方程.迭代计算时,二氧化碳和烃类组分气-油平衡常数的初值采用Wilson公式进行计算.气相和油相的状态方程采用SRK方程.分别计算了凝析气、酸气和二氧化碳-烃混合物3个算例的相平衡问题,计算值同实验实测值符合良好,验证了算法的准确性.分别对二氧化碳-烃系统和二氧化碳-烃水系统算例的相平衡进行了计算,研究了一定温度和压力条件下,系统内二氧化碳和水的含量对烃类组分平衡常数的影响.; Phase equilibrium calculation of oil-gas-water system is one of the most essential problems for properties analysis and numerical simulation of carbon dioxide flooding. Based on thermodynamics of phase equilibrium, Gibbs free energy minimization is an adaptable and stable method, and is very suitable for three-phase equilibrium calculations of carbon dioxide-hydrocarbons-water system. A phase stability variable was defined, and the Lagrange multiplier method was used for Gibbs free energy minimization problem of multiphase and multicomponent systems. The corresponding governing equations were solved by Newton-Raphson method. The initial gas-oil equilibrium constants of carbon dioxide and hydrocarbon components were obtained by Wilson equation. The SRK equation of state was adopted for gas and oil phase. Several multicomponent examples were calculated, including condensate gas, sour gas and mixtures of carbon dioxide-hydrocarbons. The simulated results agree reasonably well with the experimental data reported in the literature. The examples of carbon dioxide-hydrocarbon system and carbon dioxide-hydrocarbons-water system were also calculated. The effects of contents of carbon dioxide and water on the equilibrium constants of hydrocarbons under certain conditions of temperature and pressure were presented. ?, 2015, Science Press. All right reserved.; 国家重大科技专项; 国家重点基础研究发展计划(973)项目; EI; 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 5; 593-599; 36
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/414982]
专题	工学院
推荐引用方式 GB/T 7714	邸元,张园,Wu Yu-Shu. Gibbs自由能最小化法计算二氧化碳-烃-水系统相平衡, Phase equilibrium calculation of CO2-hydrocarbons-water system based on Gibbs free energy minimization[J]. 石油学报,2015.
APA	邸元,张园,&Wu Yu-Shu.(2015).Gibbs自由能最小化法计算二氧化碳-烃-水系统相平衡.石油学报.
MLA	邸元,et al."Gibbs自由能最小化法计算二氧化碳-烃-水系统相平衡".石油学报 (2015).