冷冻制片荧光分析法在分析聚驱后剩余油赋存状态中的应用

针对大庆油田聚合物驱后微观剩余油赋存状态及分布特征,建立了一套剩余油冷冻制片荧光分析方法,定性和定量地描述了自由态、半束缚态和束缚态三种类型微观剩余油的赋存状态和空间分布特征.结果表明,新研发的剩余油冷冻制片荧光分析法与普通荧光显微照相相比,保持了油水分布的初始状态,避免了颗粒上下遮挡和荧光干扰,可以清晰区分油水界面....

Application of frozen slice fluorescence analysis in analyzing the occurrence state of remaining oil after polymer flooding

According to the occurrence state and distribution characteristics of micro remaining oil after polymer flooding in Daqing oilfield, a set of fluorescence analysis method of frozen slice on remaining oil is established, and the occurrence state and spatial distribution characteristics of bound, semi-bound and free micro remaining oil are determined qualitatively and quantitatively. The results show that compared with ordinary fluorescence micrograph, the newly developed fluorescence analysis method of frozen slice on remaining oil maintains the initial state of oil-water distribution, avoids the upper and lower shielding of particles and fluorescence interference, and can clearly distinguish the oil-water interface. The remaining oil saturation, oil-bearing area, water bearing area and the content of different types of remaining oil can be solved by computer image analysis method. After polymer flooding, the micro remaining oil presents a distribution mode of overall dispersion and local enrichment, and the distribution characteristics have obvious regularity.With the increase of water washing degree, the percentage of movable free remaining oil gradually decreases.