非均质低渗透油层超低界面张力体系驱油方式  

Displacement mode of ultralow interfacial tension system in heterogeneous low permeability oil layers

作　　者：陈涛平[1] 张志琦[1] 

机构地区：[1]大庆石油学院提高油气采收率教育部重点实验室；黑龙江大庆163318

出　　处：《大庆石油学院学报》2009年第5期55-59,120-121,共5页Journal of Daqing Petroleum Institute

基　　金：黑龙江省教育厅科学技术研究项目(11521009);国家“973”重点基础研究发展规划项目(2005CB221303)

摘　　要：采用渗透率变异因数为0.72的人造低渗透三层纵向非均质岩心和新型超低界面张力活性剂(BS13甜菜碱型)进行超低界面张力体系驱油室内实验,对非均质低渗透油层超低界面张力体系的宏观驱油方式进行探索.结果表明:在纵向非均质低渗透油层中,较大的渗透率差异和超低界面张力活性水较高流度的联合作用,加大了驱替与被驱替相的流度比,使超低界面张力活性水及后续驱替水更易沿水驱已形成的通道向前突进,单纯注超低界面张力活性水,不能有效提高原油采收率;注入超低界面张力活性剂与低相对分子质量聚合物复配的二元体系段塞,能有效控制超低界面张力活性水的黏性指进并提高采收率;在注入化学药品总量相同的情况下,注聚合物和活性水组合段塞与注复配段塞提高采收率幅度相当.Based on the system of new ultralow interfacial tension active agent(BS13 oxyneurine)and artificial three vertical heterogeneous low-permeability cores(the permeability variation coefficient is 0.72),we have carried out the research of ultralow interfacial tension displacement system in laboratory and searched the macroscopic displacement mode of ultralow interfacial tension system of heterogeneous low permeability oil layer.The result indicated that in the vertical heterogeneous low permeability oil layers,the permeability variation coefficient of is 0.72,and the combined effect of the high diversity of permeability and the ultralow interfacial tension active water increased mobility ratio of the displacing phase and the non-displacing phase,and made ultralow interfacial tension active water and sequent displacing water advanced along the resulting channel easily,only injecting the ultralow interfacial tension active water can't enhance recovery efficiency effectively.Injecting two-component system slug of the ultralow interfacial tension active agent compounded with the polymer of low molecular mass can manipulate viscous fingering of active water and enhance recovery efficiency.If the total of the influent chemicals are equal,the two ranges of improving recovery efficiency by means of injecting the group slug of polymer and active water and injecting the compound slug are correspondent.

关 键 词：非均质油层 低渗透油层 超低界面张力 活性剂-聚合物驱油 提高原油采收率 

分 类 号：TE348[石油与天然气工程—油气田开发工程]