超高压气藏气体偏差因子的求取方法  

Determination of natural gas deviation factor of ultra-high pressured gas reservoir

作　　者：冀光[1] 夏静[1] 罗凯[1] 焦玉卫[1] 别爱芳[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083

出　　处：《石油学报》2008年第5期734-737,741,共5页Acta Petrolei Sinica

基　　金：国家基础研究发展计划(973)项目(2007CB209500);中国石油天然气股份有限公司重大科技专项科研基金(07-02Z-01)联合资助

摘　　要：利用气体分子运动论和流体状态方程理论证实,超高压下气体偏差因子与拟对比压力呈线性关系。将DAK拟合方程与其他高压拟合方程计算结果进行了对比,实际气体高压物性实验数据和高压图版验证结果表明,在超高压下,当气体拟对比压力大于15时,运用DAK方法外推求取高压范围的气体偏差因子和按Standing-Katz图版线性外推求取气体偏差因子的方法可行,且Standing-Katz图版外推方法适用于干气、湿气以及凝析气藏。Based on the theory of gas molecule movement and the equation state for fluid, it is proved theoretically that gas deviation factors under the ultra-high pressure are linearly dependent on pseudo-reduced pressure. The calculation result of Dranchuk-AbouKassem fitting equation was compared with that of the other fitting equations for high pressure and extra-pressured conditions. The performance of the DAK equation was also identified by experimental data of field gases under ultra-high pressure and by StandingKatz correlation. The results show that it is possible and practical to generate the deviation factors of gas in ultra-pressure gas reservoirs by extending the application region of DAK equation and linearly extrapolated Standing-Katz correlation when the pseudo-reduced pressure is over 15 in the same area. Furthermore, this linear extrapolation method of Standing-Katz correlation could be applicable to calculate the deviation factors for dry gas, wet gas and gas condensate reservoirs.

关 键 词：超高压气藏 气体偏差因子 拟对比压力 计算方法 高压物性实验 

分 类 号：TE332[石油与天然气工程—油气田开发工程]