CO2-CH4体系热力学性质（PVTx）研究进展  

Research progress on the thermodynamic properties（PVTx） of a CO2-CH4 mixture system

作　　者：刘树阳 张毅[3] 宋永臣[3] 孙宝江 LIU ShuYang;ZHANG Yi;SONG YongChen;SUN BaoJiang(Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)),Ministry of Education,Qingdao 266580,China;School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China;Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]非常规油气开发教育部重点实验室(中国石油大学(华东)),青岛266580 [2]中国石油大学(华东)石油工程学院,青岛266580 [3]大连理工大学海洋能源利用与节能教育部重点实验室,大连116024

出　　处：《中国科学：技术科学》2019年第12期1429-1441,共13页Scientia Sinica(Technologica)

基　　金：国家自然科学基金(批准号:U1762216);国家重点研发计划(编号:2017YFC0307304);国家重点基础研究发展计划(编号:2015CB251200)资助项目

摘　　要：开展CO2-CH4体系热力学性质研究,可以为注CO2强化非常规天然气开采中气藏内CO2-天然气混合流体的流动、扩散及运移研究提供必要的基础热物性数据,具有重要的科学意义和研究价值.本文综述了基于压缩因子测量方法和密度/体积测量方法的CO2-CH4体系热力学性质实验研究、不同类型热力学状态方程研究的国内外现状,总结了现有研究的不足及研究动向.研究分析得出主要研究趋势包括:实验测量深层、超深层气藏高温高压(超高压)条件下CO2-CH4体系的高精度密度数据;开展高CO2浓度(x>0.90)CO2-CH4体系在临界区温度压力条件下的密度测量实验研究,分析其相态和PVTx变化规律;建立或发展适用于以上温度、压力条件的状态方程,准确预测CO2-CH4体系热力学性质变化规律.本研究为今后CO2-地下流体混合体系的热力学性质研究提供了参考和借鉴.In applications of enhanced unconventional natural gas extraction by CO2,the thermodynamic properties study of the CO2-CH4 mixture system is of great significance for the flow,diffusion,and migration of CO2-natural gas fluid in gas reservoirs.This work reviews the status of the pressure-volume-temperature-composition(PVTx)experimental research for a CO2-CH4 system based on compressibility factor and density/volume methods,and modeling research on various types of thermodynamic equations of state.We also summarize the shortcomings of the existing research and point out study trends for future research.It is proposed in this work that the experimental measurement of high-precision density data of a CO2-CH4 system be conducted under high-temperature and ultra-high-pressure conditions corresponding to deep and ultra-deep gas reservoirs.The experimental density data for a CO2-CH4 system with a high CO2 concentration(x>0.90)in the vicinity of the critical point are also urgently required.The equation of state applicable to the above temperature and pressure conditions should be established or developed to accurately predict the thermodynamic properties of the system.The thermodynamic properties study of CO2-CH4 corresponding to enhanced unconventional natural gas extraction by CO2 in this work will provide a reference and guidance for future study of the thermodynamic properties of CO2-underground fluid mixture systems.

关 键 词：CO2-CH4 热力学性质 压缩因子 状态方程 

分 类 号：X701[环境科学与工程—环境工程] TE377[石油与天然气工程—油气田开发工程]