摘要
利用非均质微观刻蚀可视化玻璃模型，模拟油层不同驱替剂（聚合物P 体系、表面活性剂-聚合物SP 体系，以及碱-表面活性剂-聚合物ASP体系）的驱油效果，观察不同注入体系引起的油层油滴的变化及运移、再分布动态，研究不同注入体系对剩余油分布的影响，进一步根据剩余油分布及微观模型基本参数得到地层油采出程度和采收率，P驱、SP二元驱及ASP三元驱微观驱替的采收率分别为43%、59%和92%。聚合物的调剖作用、表面活性剂的乳化降黏作用、碱引起的超低界面张力、润湿反转及形成油膜等现象均在实验过程中得到验证并详细解释和分析。综合对比分析实验结果认为，碱/表面活性剂/聚合物ASP三元驱替仍将是化学驱提高采收率的重要措施。图23 参14
Abstract
Comparison of micro-model experiments among Polymer, Polymer-Surfactant and Alkali-Surfactant-Polymer flooding were conducted on anisotropic micro-model, modeling oilfield production from different chemical flooding. Via micro-model flooding, the oil drop shape change-transfer-redistribute was observed. Furthermore, through calculating and counting, the oil recovery of these three ways were obtained, being of 43%, 59% and 92% , respectively, for Polymer, Polymer-Surfactant and Alkali-Surfactant-Polymer flooding, respectively. The phenomenon of profile control, emulsification, ultralow interfacial tension, and wettability reversal was specifically described. In the end, the conclusion was drawn that alkali-surfactant-polymer flooding still would be the major component of chemical flooding.
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