界面张力对低渗油藏CO_2驱油气相对渗透率曲线的影响  

Effect of Interfacial Tension on Oil-gas Relative Permeability Curve in CO_2 Flooding for Low Permeability Reservoirs

作　　者：舒晓辉[1] 

机构地区：[1]中国石化集团公司办公厅,北京100728

出　　处：《石油天然气学报》2013年第3期122-123,137,共3页Journal of Oil and Gas Technology

基　　金：国家高技术研究发展计划(863)项目(2009AA063406)

摘　　要：针对腰英台低渗透油藏条件,通过高温高压界面张力仪测量了原油与CO2间界面张力随着压力的变化关系;运用非稳态JBN方法测量了低渗透油藏CO2驱过程中不同油藏压力下的油气相对渗透率曲线。对油气界面张力变化和相对渗透率曲线变化规律的研究,结果表明,随着油藏压力的增大,CO2与原油间的界面张力逐步降低,导致油气相对渗透率曲线等渗点逐步向右偏移,两相共渗区逐步拓宽,气驱残余油饱和度逐步降低,且相对渗透率曲线有向对角直线形态转变的趋势。The relationship of interfacial tension between CO2 and crude oil that was changed with pressure in Yaoyingtai low permeability reservoirs was measured through high temperature and high pressure interfacial tension measuring system.Unsteady JBN method was used to measure the gas-oil relative permeability curves in CO2 flooding at different reservoir pressures.The change rules of gas-oil interfacial tension and relative permeability curves were studied.The results show that the interfacial tension gradually decreases with the increase of reservoir pressure.Simultaneously,the isoperm points of gas-oil relative permeability curves are shifted towards the right side.And common percolation zones are gradually enlarged.The residual oil saturation of CO2 flooding is gradually declined.The relative permeability curves are gradually changed to the shape of diagonal line as the interfacial tension is equal to zero.

关 键 词：CO2驱 低渗透 界面张力 相对渗透率曲线 

分 类 号：TE357.4[石油与天然气工程—油气田开发工程]