温度、压力对含CO_2天然气高压物性参数的影响  

Effect of temperature and pressure on PVT parameters of CO_2-bearing gas reservoirs

作　　者：章星[1] 杨胜来[1] 张洁[1] 马长宁[2] 

机构地区：[1]中国石油大学,北京102249 [2]中石化胜利油田分公司,山东东营257077

出　　处：《特种油气藏》2011年第4期114-116,141,共3页Special Oil & Gas Reservoirs

基　　金：国家重点基础研究发展规划项目"温室气体提高石油采收率的资源化利用及地下埋存"(2006CB705800)

摘　　要：目前计算天然气藏高压物性参数的理论图版、经验公式等常规方法都具有一定局限性,无法准确分析含CO2天然气高压物性参数的变化规律。为解决这一问题,针对该类气藏的特殊性,采用室内PVT实验进行系统、全面地测定与分析。研究表明,对于含CO2的天然气,其偏差因子、密度、体积系数、等温压缩系数在低压(20 MPa以下)时表现出很强的压力敏感性,黏度则始终保持较强的压力敏感性。偏差因子、密度、黏度随着CO2含量增大而变化幅度较大,对CO2的敏感性较强;体积系数对CO2的敏感性较弱;等温压缩系数对CO2则无敏感性。随着压力、CO2含量的增加,其偏差因子、密度、黏度、体积系数、等温压缩系数均表现出一定的温度敏感性。There are some limitations when calculating PVT parameters of gas reservoirs with conventional methods such as theoretical chart and empirical formula,which can not accurately analyze the PVT parameters of CO2-bearing gas reservoirs.Therefore,indoor PVT tests are conducted to systematically and comprehensively analyze this type of special gas reservoirs.The study shows that for CO2-bearing natural gas,the Z-factor,density,volume factor and isothermal compressibility are highly sensitive to pressure at low pressure(below 20 MPa),while the viscosity is highly sensitive to pressure at all times.The Z-factor,density and viscosity have changed drastically along with the increasing of CO2 content,showing strong sensitivity to CO2.The volume factor is less sensitive to CO2,and the isothermal compressibility is not sensitive to CO2.With the increasing of pressure and CO2 content,the Z-factor,density,viscosity,volume factor and isothermal compressibility have shown certain sensitivity to temperature.

关 键 词：含CO2天然气 高压物性参数 敏感性 温度 压力 

分 类 号：TE311[石油与天然气工程—油气田开发工程]