基于扩展毛管数理论的化学驱相渗曲线研究

doi:10.11743/ogg20170218

摘要/Abstract

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。

关键词: 孔隙结构, 润湿性, 残余油饱和度, 扩展毛管数, 相渗曲线, 表面活性剂, 低渗透

Abstract: In order to reflect the effect of wettability and pore structure on seepage characteristics of surfactant flooding in low permeable reservoir,an extended capillary number (ECN) theoretical model is put forward,which contains wettability and pore structure on the basis of traditional capillary number (TCN) theory and combined physical simulation and mathematical treatment methods.ECN and residual oil saturation (ROS) values are collected in the different low permeability cores through experiments,and cross correlation chart between ECN and ROS is drawn.A nonlinear processing method of the relative permeability curve (RPC) is established with ECN,and reservoir engineering application is conducted.The results show that ECN theory can embody the wettability and pore structure in low permeability reservoirs,and the chemical flooding EOR needs combined action of interfacial tension reduction and reservoir wettability change in low permeability reservoirs.There is a nonlinear,negative correlation between ECN and ROS,and ROS will decrease drastically only when the increasing ECN exceeds a critical value.The nonlinear characterization method has a good agreement with the experimental results.Finally,the new method could reflect the effect of wettability and displacement characteristics of surfactant flooding,and thus provides a new tool for reservoir engineering and numerical simulation of chemical flooding in low permeability reservoirs.

Key words: pore structure, wettability, residual oil saturation, extended capillary number, relative permeability curve, surfactant, low permeability

中图分类号:

TE348

王友启,于洪敏,聂俊,等. 基于扩展毛管数理论的化学驱相渗曲线研究[J]. 石油与天然气地质, 2017, 38(2): 379-384. doi: 10.11743/ogg20170218 Wang Youqi,Yu Hongmin,Nie Jun,et al. Study on chemical flooding relative permeability curves based on the extended capillary number theory[J]. Oil & Gas Geology, 2017, 38(2): 379-384. doi: 10.11743/ogg20170218

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