| 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臧表面活性剂/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— 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l(T2inN/m降至 10"S mN/m时的最终采收率均髙于界面张力为1(T2 mN/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。 |
| 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 |
| DOI： |
| 分类号: |
| 基金项目: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) |
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| Enhanced residual oil recovery by using polymer/betaine surfactant system after water flooding |
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XIA Hui-fen1,WANG Hai-feng1,WANG Gang1,2,HU Jin-qiang1,LIU Chun-de3
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(1.Key Laboratory of Enhancing Oil and Gas Recovery of Education Ministry in Daqing Petroleum Institute,Daqing 163318，Heilongjiang Province, China ;2.Department of Science and Technology Development in Daqing Oilfield Corporation Limited,Daqing 163453, Heilongjiang Province, China;3. Exploration and Development Research Institute, PetroChina, Beijing 100083，Chirm)
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| Abstract: |
| 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-aJkali, the effect of betaine surfactant on the rheology 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 visco-elasticity 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. Hie 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 103 mNm，、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. |
| Key words: polymer surfactant binary compound system oil displacement mechanism residual oil enhanced oil recovery |
