聚合物/表面活性剂二元驱扩大波及体积性能

Performance of Polymer/Surfactant Binary Flooding in Enlarging Swept Volumes

魏云云 刘建军 罗莉涛 刘先贵 杨正明

WEIYunyun LIUJianjun LUOLitao LIUXiangui YANGZhengming

中国科学院大学, 北京 石景山 100190 中国科学院渗流流体力学研究所, 河北 廊坊 065007 中国石油勘探开发研究院, 河北 廊坊 065007 西南石油大学地球科学与技术学院, 四川 成都 610500 清华大学环境学院, 北京 海淀 100084

University of Chinese Academy of Sciences, Shijingshan, Beijing 100190, China Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Science, Langfang, Hebei 065007, China PetroChina Research Institute of Petroleum Exploration & Development, Langfang, Hebei 065007, China School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China School of Environment, Tsinghua University, Haidian, Beijing 100084, China

利用微观刻蚀、层间非均质平板、层内非均质平板模型驱油实验研究聚合物/表面活性剂二元驱扩大波及体积性能。结果表明，残余油多以膜状、岛状、喉道、盲端、柱状、簇状等6种形式存在。微观上，二元驱转向水驱无法波及的含油孔隙区域内驱替残余油；宏观上，其对高渗透区域产生封堵，迫使其进入渗流阻力较小的低渗透区域内驱替残余油，扩大波及体积效果显著，提高采收率13.4%~14.3%。二元驱通过聚合物增加驱替液黏度，使其吸附及滞留在孔隙中，降低驱替相渗透率，驱替相流度减小；二元驱对油黏度影响很小，油聚集在驱替液前缘，增加油相渗透率，油相流度变大。由此，两相流度比减小，克服注水指进，增加吸水厚度，提高波及系数，进而提高采收率。

Oil displacement experiments were carried out using microetching and slabs with interlayer and intralayer heterogeneities, in order to investigate the performance of polymer/surfactant binary floods in enlarging the swept volumes. The results indicate that the residual oils exist in the form of films, islands, throats, dead ends, columns, and clusters. On the microscopic scale, the binary flooding was found to displace residual oils from oil-containing pores that could not be swept by water flooding. On the macroscopic scale, the binary flooding generated blockages in high-permeability zones, causing the floods to enter low-permeability zones with lower levels of resistance to seepage, thus displacing residual oils in these zones. Binary flooding increased recovery rates by 13.4%~14.3% as compared to water flooding, and thus had a significant effect on enlarging the swept volumes. In binary flooding, the polymer increased the viscosity of the displacing fluid, causing the latter to become adsorbed and retained in the pores. This effectively decreased the permeability and flow rate of the displacement phase. Meanwhile, binary flooding had a very small impact on oil viscosity, and therefore the oils aggregated along the leading edge of the displacing fluid, which increased the permeability and flow rate of the oil phase. Therefore, such binary flooding reduces the mobility ratio, prevents viscous fingering, and increases water intake thickness and conformance factor, thus improving oil recovery rates.

10.11885/j.issn.1674-5086.2017.04.29.01