注气对挥发性原油饱和压力的影响  

Effect of Gas Injection on Saturation Pressure of Volatile Oil Reservoir

作　　者：文玉莲[1] 杜志敏[1] 

机构地区：[1]西南石油学院,四川南充637001

出　　处：《新疆石油地质》2004年第5期520-522,共3页Xinjiang Petroleum Geology

摘　　要：注入气与地下原油混合将改变原油藏流体的饱和压力,影响原油流动能力。饱和压力的改变尤其容易影响挥发性油藏的开发动态。在不考虑多孔介质对相态的影响,假定注入气与原油在PVT筒中直接充分混合的条件下,利用气液两相平衡原理,根据油田实际资料,分析了注入气对挥发性原油饱和压力的影响。研究结果表明,将天然气、甲烷或氮气注入到原油中,随着注入量增加,原油饱和压力增加,相同注入量下注入氮气使饱和压力增加的幅度最高;注入气中间组分含量增加趋于使原油饱和压力降低;注入量增加使注入气与原油的混相压力趋于上升。Mixing of injected gas and reservoir oil will change the initial saturation pressure, affect the deliverability of the oil. And the change of saturation pressure could affect the performance of volatile oil reservoir. This paper analyzes the effect of injected gas on saturation pressure of volatile crude reservoir under the assumed direct and complete mixing between injected gas and crude in PVT test by using the balance theory of gas-liquid two phases and field data, without consideration of effect of porous media on phase behavior. The results show that when natural gas, methane or nitrogen are injected into volatile oil sample, the oil saturation pressure will increase with incremental injected gas volume, of which the nitrogen injection assures the biggest saturation pressure, adding intermediates injected volume tends to decrease of the saturation pressure, whereas increasing overall injected volume would enable the miscibility pressure of the injected gas and crude oil to increase.

关 键 词：注气 挥发性原油 饱和压力 混相驱 

分 类 号：TE357.7[石油与天然气工程—油气田开发工程]