非均质油藏二元复合驱合理毛管数实验  

Experiment on reasonable capillary number for binary compound flooding in het-erogeneous reservoir

作　　者：李堪运 李翠平 赵光[2] 温栋良[3] 

机构地区：[1]中国石油长庆油田第一采油厂,陕西延安716000 [2]中国石油大学(华东)国家重质油重点实验室,山东青岛266580 [3]中国石化河南油田分公司石油工程技术研究院,河南南阳473132

出　　处：《油气地质与采收率》2014年第1期87-91,117,共5页Petroleum Geology and Recovery Efficiency

摘　　要：为研究非均质油藏毛管数对二元复合驱油体系最终采收率的影响,选取渗透率级差为2的非均质物理模型,考察了不同粘度和界面张力下二元复合体系的增油效果。结果表明:在一定的界面张力条件下,二元复合体系粘度越大采收率增值越大,但存在临界粘度,即15 mPa·s;达到临界粘度后采收率增值变化趋于平缓,且界面张力为1.865×10-2mN/m时采收率增值最大,此时界面张力即为二元复合体系的合理界面张力,其与临界粘度所对应的毛管数即为二元复合体系合理毛管数,即1.975×10-2。采用微观可视化模型,对比了10-3,10-2,10-1mN/m这3个数量级毛管数二元复合体系的驱油差异。结果表明:针对非均质油藏,二元复合体系并非毛管数越大提高采收率能力越强,合理毛管数下的二元复合体系除具有一定的洗油能力外,其所形成的乳化液滴对非均质油藏高渗透层还具有一定的封堵作用,提高采收率能力更强。In order to study the influence of capillary number on binary compound flooding system final oil recovery in the heteroge-neous reservoir, the binary compound flooding experiments for different viscosities and interfacial tensions are carried out to evaluatethe capacity so as to enhance the oil recovery in the heterogeneous reservoir with different capillary numbers(10-6-100),and the differ-ences of flooding process among different capillary number formulas are compared by microscopic visualization physical model. Theflooding result shows that when the interfacial tensions are the same, the higher the viscosity, the higher oil recovery, but there exists acritical viscosity of binary compound flooding. The increment of oil recovery becomes stable when the critical viscosity is reached, andwhen the viscosity of binary compound system is smaller than critical viscosity, the lower the interfacial tension, the higher oil recoveryincrement; when the viscosity of binary compound system is higher than critical viscosity, there is a reasonable interfacial tension of bi-nary compound system, and the oil recovery reaches maximum at the reasonable interfacial tension(1.865×10-2mN/m). The oil recov-ery reaches the highest at critical viscosity and reasonable interfacial tension, and the reasonable capillary number is obtained. The mi-croscopic visualization physical simulation experiment shows the reasonable capillary number formula. The formula with this capillarynumber has certain oil-washing ability,besides, the emulsion formed with this formula has profile control capacity on the target reser-voir.

关 键 词：非均质油藏 合理毛管数 二元复合驱 临界粘度 界面张力 采收率 

分 类 号：TE357.43[石油与天然气工程—油气田开发工程]