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聚合物/甜菜碱表面活性剂提高水驱后残余油采收率研究

期刊名称：中国石油大学学报(自然科学版)，2007，（06）
时间：0
分类：TE39[石油与天然气工程—油气田开发工程]
作者机构：[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, [2]大庆油田有限责任公司技术发展部,黑龙江大庆163453, [3]中国石油勘探开发研究院,北京100083
相关基金：国家自然科学基金重点项目（50634020）和黑龙江省自然科学基金项目（E200621）
相关项目：低渗透油层提高驱油效率的机理研究

关键词：聚合物, 表面活性剂, 二元复合体系, 驱油机理, 残余油, 提高采收率, polymer, surfactant, binary compound system , oil displacement mechanism, residual oil , enhanced oil recovery

中文摘要：

利用不加碱可形成超低界面张力的甜菜碱表面活性剂／聚丙烯酰胺二元复合体系，通过流变性实验，分析了甜菜碱表面活性剂对聚合物／表面活性剂二元复合体系流变性的影响；通过可视化的微观驱油实验和人造岩心驱油实验，分析了聚合物／表面活性剂二元体系的粘弹性和界面张力对采收率的影响，研究了该二元复合体系对水驱后残余油的作用机理。结果表明，实验用的两性表面活性剂体系与油可以达到超低界面张力，表面活性剂体系对无碱二元体系的粘弹性影响非常小。在驱替水驱残余油过程中，形成超低界面张力的甜菜碱表面活性剂／聚丙烯酰胺二元复合体系可以同时发挥活性剂的超低界面张力作用和聚合物溶液的粘弹性作用，使该二元体系的采收率高于单一的表面活性剂体系和聚合物驱油体系，并且该二元体系的粘弹性越大，采收率越高。界面张力由10^-2mN／m降至10^-3mN／m时的最终采收率均高于界面张力为10^-2mN／m时增加聚合物溶液的质量浓度和相对分子质量两种情况下的最终采收率。

英文摘要：

Using a polymer/betaine surfactant compound system for short surfactant/polymer （SP） compound system that can attain ultra-low interfacial tension with oil at conditions of no-alkali, the effect of betaine surfactant on the theology of SP compound system was analyzed through rheology experiment. Through oil-displacement experiments by micro-visualization models and artificial cores, the influence of visco-elasticity and interfacial tension of SP compound system on recovery efficiency was analyzed, and the action mechanism of the SP compound system on residual oil after water flooding was studied. The results show that the ultra-low interfacial tension between amphoteric betaine surfactant and oil can be formed, and the influence of betain surfactant on viscolasticity of the SP compound system is slight. Both the mobility control characteristic of polymer and the ultra-low interfacial tension characteristic of the surfactant can be utilized fully in polymer/amphoteric surfactant flooding. The core flooding experiments indicate that the oil recovery after polymer/surfactant systems flooding is better than that of single surfactant flooding and is also better than that of single polymer flooding, and the visco-elasticity of the SP compound system is larger, oil recovery is higher. When the interfacial tension decreases from 10^-2 mN/m to 10^-3 mN/m, the ultimate recovery of SP compound solution at 10^ -3 mN/m is higher than that of the increase in mass concentration or relative molecule mass of SP compound system at 10 ^-2 mN/m.

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