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本文根据大庆油田历年来密闭取心油水饱和度与残余油物理化学性质分析资料,研究了注水开发油田储层残余油物理化学性质变化特征与变化因素,初步探讨了储层不同含水饱和度与残余油含量变化与分布,并提出了残余油物理化学性质与变化因素的研究方法。 本文认为储层残余油性质变化很大程度上决定于水洗程度、注入水的性质及水中各种金属元素含量变化。由于注入水的长期冲刷,必然造成残余油中轻组分的减少,重组分富集,而使储层残余油的相对密度,平均分子量,非烃和沥青质含量发生变化。本文研究结果表明,残留在微细孔隙中受毛细管力束缚及未水洗到夹层内与低渗透带的残余油物理化学性质稳定。
Based on the analysis of physicochemical and chemical properties of residual oil in closed-cut oil-bearing wells over the years in Daqing Oilfield, the change characteristics and variation factors of physical and chemical properties of residual oil in oilfield development are studied. The effects of different water saturations and residuals Oil content changes and distribution, and put forward the physical and chemical properties of residual oil and changes in research methods. This paper argues that the change of the properties of residual oil in reservoirs depends largely on the degree of water washing, the nature of water injected, and the variation of various metal elements in water. Due to the long-term flushing of injected water, it is bound to cause the decrease of light components in residual oil and the enrichment of heavy components, which will change the relative density, average molecular weight, non-hydrocarbon and asphaltene contents of residual oil in reservoirs. In this paper, the results show that residual oil trapped in fine pores by capillary forces and unwashed to interlayers and low permeability zone of the residual oil physicochemical properties are stable.