大庆石油地质与开发

2015, v.34;No.169(03) 143-146

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贝雷岩心孔隙结构特点及其驱替特征
PORE STRUCTURE AND DISPLACEMENT CHARACTERISTICS OF BEREA CORE

王克亮,袁圆,伊鹏,孙术杰,李维亮,ZHUO Yue
WANG Keliang,YUAN Yuan,YI Peng,SUN Shujie,LI Weiliang,ZHUO Yue

摘要(Abstract):

选取渗透率约为0.3μm~2和0.8μm~2的天然岩心、人造岩心和贝雷岩心进行压汞实验,绘制了3种岩心的毛管力曲线,对比分析了不同类型岩心的孔隙和喉道特点。使用不同界面张力等级的复合体系在3种岩心中进行了驱油实验,分析了3种岩心的驱替特征。研究结果表明:人造岩心孔隙分布集中、结构单一,增加驱替体系黏度就能取得较好的驱油效果,无法充分体现界面张力对驱油效果的影响;贝雷岩心和天然岩心无论从孔隙结构上还是驱替特征上都具有极大的相似性,但由于同一地区天然岩心黏土含量不同等原因,用天然岩心进行驱油实验存在实验结果重复性差、平行实验对比难的问题。因此,用贝雷岩心进行驱油所得到的实验结果既具有良好的重复性,又能反映出不同性质驱油体系的驱替特征。
The natural,artificial and Berea cores with two different permeabilities(about 0.3μm~2 and 0.8 μm~2)are selected for mercury penetration experiment,and then the capillary force curves are plotted,the pore and throat characteristics of the different cores are contrasted and analyzed.By means of the oil displacing experiments of ASP systems with different interfacial tension levels,the displacement characteristics of these three kinds of cores are analyzed.The study results show that the pore structure contribution of the natural core is concentrated,but rather single,much better flooded effects are obtained thanks to the increased system viscosity and influence of the interfacial tension can not be reflected;Compared with the artificial and Berea cores,there are great similarity no matter in the pore structures but the displacement characteristics.But the problems exist for the natural cores that the rather poorer experimental result repeatability and contrast difficult in the parallel test due to the reasons such as different clay contents and so on in the same region.Therefore,the experimental results from Berea cores are not only repeatable perfectly,but also can reflect the displacement characteristics of different qualities of the oil flooding systems.

关键词(KeyWords): 人造岩心;天然岩心;贝雷岩心;孔隙结构;界面张力;驱油效果
artificial core;natural core;Berea core;pore structure;interfacial tension;displacement effect

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目“原油对泡沫稳定性作用机理研究”(51374073);; 国家科技重大专项“复杂油气田地质与提高采收率技术”(2011ZX05009)联合资助

作者(Author): 王克亮,袁圆,伊鹏,孙术杰,李维亮,ZHUO Yue
WANG Keliang,YUAN Yuan,YI Peng,SUN Shujie,LI Weiliang,ZHUO Yue

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