色谱分离对三元复合体系界面张力的影响及对策  

Effect of chromatographic separation on ASP system interface tension and the countermeasures

作　　者：任佳维 吴文祥[1] 张栋[1] REN Jiawei;WU Wenxiang;ZHANG Dong(Key Laboratory of Enhanced Oil Recovery of Education Ministry, Northeast Petroleum University, Daqing, Heilongjiang 163318, China)

机构地区：[1]东北石油大学提高采收率教育部重点实验室,黑龙江大庆163318

出　　处：《河北科技大学学报》2016年第3期249-254,共6页Journal of Hebei University of Science and Technology

基　　金：国家重大专项课题(2011ZX05009-004);东北石油大学研究生培养创新基地创新科研项目(YJSJD2015-001NEPU)

摘　　要：针对三元复合驱由于存在色谱分离现象而改变了体系原有性质的问题,利用实验室优选超低界面张力的三元复合体系进行填砂管流动实验,展开色谱分离对三元复合体系界面张力影响的研究。以"突破时间"和"产出时差"两个参数描述色谱分离程度,测定每次出口端采出液120min时的界面张力。研究表明:复合体系中的三种化学剂间存在色谱分离现象,聚合物最早突破,表面活性剂最后突破;表面活性剂与聚合物之间的色谱分离程度最明显,聚合物与碱之间的色谱分离程度最小;色谱分离使三元复合体系界面张力由10-3数量级增加到10-2数量级,影响了三元复合体系的驱油效果,因此降低表面活性剂在地层中的损失将成为降低色谱分离程度的主要措施。采用槐糖脂作为牺牲剂代替部分表面活性剂放在三元复合体系前注入地层,可以有效降低色谱分离的影响,更有效地提高最终采收率。Because of the existing chromatographic separation phenomenon,ASP flooding changes original nature of the system.Therefore,in laboratory ultra-low interfacial tension ASP system is preferred for sand packs flow experiment to research on the effect of chromatographic separation on ASP system interface tension.The two parameters of ' breakthrough time' and 'output difference' are used to describe the degree of chromatographic separation,and the produced fluid interfacial tensions at the outlet end at 120 min is measured.The research shows that there exists chromatographic separation between three chemicals of ASP system,with first polymer breakthrough and finally surfactant breakthrough;there is most serious chromatographic separation between surfactant and polymer,while minimum chromatographic separation between alkali and polymer;chromatographic separation makes ASP interfacial tension increase from 10-3 magnitude to 10-2 magnitude,affecting flooding effect ofASP system.Thus,reducing the loss of surfactant in the formation will be the main measure to reduce the degree of chromatographic separation.Using sophorolipid as sacrificial agent to replace part of the surfactant injected into formation before ASP system can effectively reduce the impact of chromatography separation and more effectively improve the ultimate recovery ratio.

关 键 词：表面活性剂 色谱分离 界面张力 三元复合体系 采收率 驱油效果 牺牲剂 

分 类 号：TQ028[化学工程] TE357.43[石油与天然气工程—油气田开发工程]