CO_(2)状态方程适应性对比研究  

Comparative study for adaptation to CO_(2) equation state equation

作　　者：刘涛[1] 刘伟[1] 郑华安 戴邓仅 董洁 邹雪飞 刘文 LIU Tao;LIU Wei;ZHENG Huaan;DAI Dengjin;DONG Jie;ZOU Xuefei;LIU Wen(College of Energy,Chengdu University of Technology,Chengdu 610059,China;Hainan Branch,CNOOC(China)Co.,Ltd.,Haikou 570312,China)

机构地区：[1]成都理工大学能源学院,成都610059 [2]中海石油(中国)有限公司海南分公司,海口570312

出　　处：《非常规油气》2024年第1期85-93,共9页Unconventional Oil & Gas

基　　金：国家自然科学基金项目“CO_(2)-降黏剂在超稠油油藏中动态扩散传质规律研究”(51974038)。

摘　　要：气体状态方程被广泛应用于计算CO_(2)的各项物性参数,但CO_(2)物性参数对温度和压力较敏感,不同状态方程计算的结果有偏差。针对目前常用的状态方程开展适应性研究,基于不同温度和压力条件下CO_(2)物性参数实验值对比分析了不同状态方程的计算结果。结果表明:1)GERG对CO_(2)密度及压缩因子具有较高的计算精度。计算CO_(2)密度时蒸汽区平均相对偏差小于0.5%,气相区小于1%;2)SW方程计算CO_(2)定压比热的平均相对偏差为0.29%,计算焦汤系数的平均相对偏差为0.87%;3)Fenghour法计算的黏度最大相对偏差不超过0.5%,平均相对偏差为0.34%,计算结果误差较小;4)V-W法对CO_(2)导热系数的计算结果与实验值较吻合,其平均相对偏差仅为1.24%。研究结果为油气田开发过程中涉及的CO_(2)物性参数计算提供了一定的参考依据。The gas equation of state is widely used to calculate various physical parameters of CO_(2).However,the CO_(2) physical property parameters are sensitive to temperature and pressure,and the results calculated by different state equations deviate.In this paper,the adaptation of the currently used state equation was investigated,and the calculation results by different state equations were compared and analyzed based on experimental values of CO_(2) physical parameters at different temperature and pressure conditions.The results show that:1)GERG has high accuracy in calculating CO_(2) density and compression factor.The average relative deviation in the calculation of CO_(2) density is less than 0.5%in the vapor region and less than 1%in the gas phase region.2)The average relative deviation of the SW equation is 0.29%for calculating the specific heat of CO_(2) at constant pressure,and the average relative deviation is 0.87%for calculating the Joule Thomson coefficient of CO_(2).3)The maximum relative deviation of CO_(2) viscosity calculated by the Fenghour method does not exceed 0.5%,and the average relative deviation is 0.34%.4)The results of the V-W method for the thermal conductivity of CO_(2) are in good agreement with the experimental values,with an average of only 1.24%relative deviation.

关 键 词：油田开发 CO_(2) 物性参数 状态方程 热力学性质 平均相对偏差 

分 类 号：TE311[石油与天然气工程—油气田开发工程] TK121[动力工程及工程热物理—工程热物理]