基于扩展毛管数理论的化学驱相渗曲线研究

发布时间：2018-03-19 18:00

本文选题：孔隙结构　切入点：润湿性　出处：《石油与天然气地质》2017年02期 　论文类型：期刊论文

【摘要】：为了体现润湿性和孔隙结构对表活剂驱渗流特征的影响,在传统毛管数理论的基础上,通过物理模拟与数学处理相结合,提出了低渗透油藏包含润湿性和孔隙结构特征的扩展毛管数理论模型,并通过试验获得了不同低渗岩心对应的扩展毛管数与残余油饱和度,绘制了两者之间的关系图版,据此建立了基于扩展毛管数的相渗曲线非线性处理方法,并进行了油藏工程应用。研究表明,扩展毛管数理论能够体现出低渗透油藏中润湿性和孔隙结构的影响,而低渗透油藏化学驱油需要降低界面张力和改变储层润湿性的共同作用。扩展毛管数与残余油饱和度具有非线性递减函数关系,并只有当其超过临界值时,残余油饱和度才会随其增加而大幅度地下降。基于扩展毛管数的残余油饱和度非线性表征方法,与实验计算结果吻合很好。低渗透油藏化学驱相渗曲线处理新方法能够体现润湿性的影响和表活剂体系的驱替特征,为低渗透油藏化学驱油藏工程和数值模拟研究提供了依据。
[Abstract]:In order to reflect the influence of wettability and pore structure on percolation characteristics of surface active agent flooding, based on the traditional capillary number theory, the physical simulation and mathematical treatment are combined. A theoretical model of extended capillary number including wettability and pore structure characteristics in low permeability reservoirs is proposed. The corresponding extended capillary numbers and residual oil saturation of different low permeability cores are obtained by experiments, and the relationship between them is plotted. Based on this, the nonlinear processing method of phase permeability curve based on extended capillary number is established and applied in reservoir engineering. The research shows that the theory of extended capillary number can reflect the influence of wettability and pore structure in low permeability reservoir. However, chemical flooding in low permeability reservoirs needs to reduce the interfacial tension and change the wettability of the reservoir. The extended capillary number and residual oil saturation have a nonlinear decline function, and only when it exceeds the critical value, The residual oil saturation decreases significantly with the increase of residual oil saturation. The nonlinear characterization method of residual oil saturation based on extended capillary number is presented. The new treatment method of chemical flooding phase and permeability curve in low permeability reservoir can reflect the effect of wettability and the displacement characteristics of surface active agent system, which provides a basis for the engineering and numerical simulation of chemical flooding reservoir in low permeability reservoir.
【作者单位】：中国石化石油勘探开发研究院;
【基金】：中国石油化工股份有限公司科技攻关项目(P13124)
【分类号】：TE357.46

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