基于低质量浓度表面活性剂的复合驱效果评价  

Evaluation of low-concentration surfactant system for chemical flooding

作　　者：谢玉银[1,2,3] 侯吉瑞[1,2,3] 张建忠[1,2,3] 谢东海[1,2,3] 任飞[4] 张玥 

机构地区：[1]中国石油大学(北京)提高采收率研究院,北京102249 [2]中国石油三次采油重点实验室低渗油田提高采收率应用基础理论研究室,北京102249 [3]教育部油田开发重点实验室,北京102249 [4]中国石油大学(北京)石油工程学院,北京102249

出　　处：《油气地质与采收率》2014年第1期74-77,116,共4页Petroleum Geology and Recovery Efficiency

基　　金：国家自然科学基金"ASP复合驱油藏油水界面张力变化规律及残余油启动机制研究"(51174216)

摘　　要：以往为了达到超低界面张力，复合驱大多使用较高质量浓度的表面活性剂，通常为1000～3000mg／L，不仅增加了成本且未必能取得好的驱油效果。为了探究低质量浓度表面活性剂的驱油效果，设计了低质量浓度表面活性剂的复合驱物理模拟实验。静态实验结果表明，在低质量浓度表面活性剂条件下，油水界面张力可达到10^-2mN／m数量级及以下，加碱后，界面张力更低；碱和表面活性剂都会对聚合物的粘度和粘弹性产生影响，碱在较高温度下会大幅度降低复合体系的粘度和粘弹性。驱油实验结果表明，与水驱相比，在所选择的低质量浓度表面活性剂驱油体系中，表面活性剂一聚合物二元复合驱和碱一表面活性剂一聚合物三元复合驱均可提高采收率19．5％以上，三元复合驱的驱油效果最好，提高采收率21．8％以上。这表明低质量浓度表面活性剂驱油体系驱油效果很好。Surfactant with higher mass concentration from 1 000 mg/L to 3 000 mg/L is always used in ASP or SP flooding for getting ul-tra-low interfacial tension. Using surfactant with higher concentration does not always enhance the oil recovery, although it increasesthe cost of production. Through six displacement experiments, the most appropriate systems for Nanyang oilfield are selected. Using lowconcentration surfactant can improve the recovery efficiency significantly.The alkali/surfactant/polymer system can improve oil recov-ery by 22.3%, better than that of surfactant/polymer system, alkali/polymer system and polymer system. Before the displacement experi-ments, the oil-water interfacial tension, viscosity and viscoelasticity of flooding systems are tested. The conclusions are as follows: first,low-concentration surfactant can lower the interfacial tension to below 10-2mN/m; second, the surfactant and the alkali used in this ex-periment can both influence the viscosity and viscoelasticity of the polymer.

关 键 词：低质量浓度 表面活性剂 化学复合驱 提高采收率 界面张力 粘度 粘弹性 

分 类 号：TE357.43[石油与天然气工程—油气田开发工程]