喇嘛甸油田聚驱后蒸汽驱提高采收率研究

EOR study of steam drive after polymer flooding in Lamadian oilfield

喇嘛甸油田葡I1—2油层聚合物驱结束后剩余油分布零散,开采难度大,蒸汽驱的降粘、蒸汽蒸馏及蒸汽超覆等作用使其成为聚驱后提高采收率的主要方法之一。喇嘛甸油田岩石及聚驱后原油热物性参数实验和蒸汽驱岩心驱替实验结果表明,聚驱后进行蒸汽驱可增加油相渗透率,降低残余油饱和度,大幅度提高驱油效率和原油采收率。

The residual oil after polymer flooding in P I1-2 oil layer is rather scattered and difficult to produce in Lamadian oilfield, but the effects of steam drive such as reducing viscosity, distillation, overlapping and so on make it become one of the main methods to enhance oil recovery after polymer flooding. The test results of thermal and physical parameters of oilfield rocks and crude oil after polymer flooding and moreover core displacement show that steam drive can increase oil relative permeability, reduce residual oil saturation and greatly enhance sweep efficiency and oil recovery after polymer flooding.