聚合物-表面活性剂二元驱提高采收率机理实验

发布时间：2018-06-15 06:22

本文选题：聚合物 + 表面活性剂　；参考：《石油勘探与开发》2017年04期

【摘要】：针对新疆油田七中区开发现状,设计聚合物-表面活性剂二元驱的填砂管、天然岩心及微观模型驱油实验,研究二元驱提高采收率机理,为油田现场提供二元驱优化配方。二元驱采收率增幅随着水油黏度比增大而增大,随着界面张力减小而增大。毛细管准数反映二元体系溶液黏度和界面张力的协同效应,应以其为准优化筛选最佳配方。新疆油田七中区二元驱溶液临界黏度比2.5、临界界面张力数量级为1′10-2 m N/m、临界毛细管准数数量级为1′10-3;优选出配方为0.3%KPS-1+1 115 mg/L HPAM,可提高采收率23.96%。二元驱通过聚合物增黏,降低驱替相流度,增加油相流度,使流度比减小,克服了注水指进,增加了吸水厚度,从而提高波及系数,进而启动盲端残余油;通过表面活性剂降低界面张力,降低黏附功,使残余油乳化、剥离、拉丝并易于启动,同时乳状液进一步增加驱替相黏度,在低界面张力和较高黏度下,毛细管准数大幅度提高,从而提高洗油效率,进而启动岛状、柱状及膜状残余油,最终提高了采收率。
[Abstract]:In view of the present situation of development in the seventh middle area of Xinjiang Oilfield, the experiments of sand filling pipe, natural core and microscopic model flooding of polymer surfactant binary flooding were designed to study the enhanced recovery mechanism of binary flooding and to provide the optimized formula for binary flooding in oil field. The oil recovery increases with the increase of water / oil viscosity ratio, and increases with the decrease of interfacial tension. The capillary number reflects the synergistic effect of solution viscosity and interfacial tension in binary system. The critical viscosity ratio of binary flooding solution is 2.5, the critical interfacial tension of binary flooding solution is 2.5, the critical interfacial tension is 1 10 -2 m N / m, and the critical capillary number is 1 10 -3, and the optimum formula is 0.3 KPS-1 1 115 mg / L HPAM, which can improve the recovery rate of 23.96 mg / L. Binary flooding increases viscosity by polymer, reduces displacement phase mobility, increases oil phase mobility, reduces mobility ratio, overcomes water injection entry, increases water absorption thickness, thus increases sweep efficiency and starts residual oil at blind end. By reducing the interfacial tension and the adhesion work of surfactant, the residual oil can be emulsified, stripped, drawn and started easily. At the same time, the emulsion further increases the viscosity of the displacement phase, and under the condition of low interfacial tension and high viscosity, The capillary number is greatly increased, which improves the efficiency of oil washing, and then starts the island, columnar and membrane residual oil, and finally improves the oil recovery.
【作者单位】：中国石油勘探开发研究院;中国科学院渗流流体力学研究所;清华大学环境学院;中国石油勘探与生产分公司;中国石化石油工程技术研究院;
【基金】：国家科技重大专项(2011ZX05013-006) 中国石油科技攻关项目(2014B-1203)
【分类号】：TE357.46

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