水驱油微观物理模拟实验研究

应用与地层孔隙结构相似的微观仿真模型进行驱油实验,通过微观驱油动态彩色图象量化处理系统对实验的过程和结果进行分析,从定性和定量两个方面对水驱油渗流规律,水驱油剩余油形式及这些剩余油形式对三次采油的应用效果进行了分析,在水驱油过程中,由于润湿性的不同注入水表现出没的入孔机理,在强亲水的孔隙内,注入水沿着孔壁“爬入”;在亲油孔隙内,注入水沿孔隙的中心突入,由于油层非均质性的影响,水驱后剩余河可分为连片状剩余油和分散型剩余油两类。具体形式有簇状,柱状,角状,膜状和“孤岛”状等。对于不同的剩余油形式,各种化学驱的效果有所不同,聚合物驱主要驱替连片状剩余油,而三元复合驱和泡沫复合驱对连片状剩余油和分散型剩余油都能有效地进行驱替。

Experimental Study on the Process of Water-oil Displacement with the Micro-model

This theme analyzes the process of water oil displacement, modality of remaining oil and the effect of tertiary recovery for these remaining oil from the way of qualitative and quantitative analysis, experiment in expulsion of oil on the micro model whose pore structure is similar to reservoir. Experimental process and result are analyzed with computer analyzing system.It was found from analysis of process of water oil displacement that mechanism of injected water is different by reason of different wettability, injected water "climb" in the pore of strongly water wet and enter along the middle in the pore of oil wet. It was also found macroscopical and microcosmic finger advance, water and oil will keep itself continuity in the process of water flooding.There are two kinds of remaining oil after water flooding, one is consecutive, the others is separate, the basic modality is cluster, pole, corner, film and island. For every kind of remaining oil, the effect of tertiary recovery is different, polymer is effectual to the consecutive remaining oil, alkali/surfactant /polymer and alkali / surfactant /polymer foam are effectual to either consecutive or separate remaining oil.