两种介质注入对原油物性的影响  

The Effect of Two Mediums Injection on Crude Property

作　　者：熊钰[1] 高平[2] 

机构地区：[1]西南石油学院石油工程学院,四川南充637001 [2]中国石化中原油田分公司,河南濮阳457000

出　　处：《新疆石油地质》2004年第1期58-60,共3页Xinjiang Petroleum Geology

基　　金：油气藏地质及开发工程国家重点实验室开放基金项目(编号PLN0118)

摘　　要：注入介质对原油高压物性影响的研究是注气提高采收率的室内评价手段之一,注富烃气和氮气后原油高压物性参数变化规律的研究是分析注气后沿混相及前沿混相和非混相驱替过程室内评价的基础。在对一实际轻质原油高压物性分析的基础上,分别进行了富烃气注入和氮气注入实验及多次接触实验,对比研究了注入这两种气体后轻质原油的相态、饱和压力、粘度、容胀特性、气油比和脱气原油密度等特性的变化规律,分析了氮气抽提作用对原油PVT特性的影响。结果表明,在一次接触混相条件下,注富烃气和氮气后轻质原油的高压物性参数具有相似变化规律,但是氮气对原油粘度、体积系数、密度等参数的改善不如富烃气注入明显,氮气将引起原油饱和压力急剧上升;在氮气驱过程中后沿地层原油很快变重,若不能达到和保持前沿混相,氮气驱效果将很差。The effect of medium injection on PVT p ro perties of crude is studied as one of evaluation means in laboratory for EOR by gas injec-tion process.Injection of rich gas and N 2 followed by study of the variations of PVT parameters of crude is the basis of making laboratory evalua-tions for different displacement processes as tra iling edge miscible flooding,front miscible flooding and non-miscible floodin g.On the basis of PVT analysis of actual light oil,a rich gas and N 2 injection experiment and N 2 multi-contact experiment are studied,respectively,including com-parison of variations of oil phase behavior,saturated pressure,viscosity,B o ,GOR and? o after injection of these two gases.In addition,the effect of N 2 extraction on the PVT properties is analyzed.The results show that similar variation of PVT properties for rich gas and N 2 injection occurs when the one-contact miscible flooding,but N 2 is not so good as rich gas in improvement of crude viscosity,volume factor and density,as a result of quick increase of oil saturated pressure;also,und er N 2 flooding,the trailing edge miscible formation crude will become heavy quick ly,result-ing in poor effectiveness by N 2 flooding if not achieving at and holding front miscible displacement.

关 键 词：原油物性 注气 采收率 评价 氮气 

分 类 号：TE357.7[石油与天然气工程—油气田开发工程]