大庆油田三元复合驱矿场试验动态特征

相对于其他提高采收率方法,三元复合驱对原油性质和油藏性质更为敏感。为此,大庆油田在室内研究成功的基础上,先后进行了5个三元复合驱矿场试验,研究了不同油藏特性、不同井距和不同配方的三元复合驱特征。试验结果表明,与聚合物驱相比,三元复合驱过程中注入能力下降幅度低,采出能力和综合含水的下降幅度大,在低含水期出现了乳化和结垢现象,三元复合驱比水驱提高采收率20%以上。尽管注采能力下降,但由于含水率大幅度降低,所以三元复合驱仍保持了较高的采油速度.

FIELD TEST PERFORMANCE OF ALKALINE SURFACTANT POLYMER FLOODING IN DAQING OIL FIELD

Alkaline surfactant polymer (ASP) flooding is more complicated and sensitive to oil characteristics and reservoir features than other enhance oil recovery (EOR) methods.On the basis of laboratory test,five field tests of ASP flooding were conducted to study the response performances to ASP injection,including pilot test and extended test sequence under the conditions of different reservoir characteristics,well patterns,well spaces and ASP compositions.ASP test results show that the injectability of reservoir decreased less,the fluid productivity decreased a little more,and water cut decreased much more.The incremental oil recovery increased by 20% with ASP flooding more than with polymer flooding.Field tests also show that ASP flooding has higher recovery rate than polymer flooding though some emulsion and scaling produced at low water cut.