基于延展型表面活性剂的化学驱体系驱油机理研究

doi:10.3969/j.issn.2097-2806.2025.12.001

Abstract

Abstract:

The extended surfactant with high temperature resistance, salt resistance and high interfacial activity is an important oil displacement component for enhancing oil recovery in high-temperature and high-salinity reservoirs. To clarify the oil displacement mechanism of the binary compound flooding of extended surfactant and polymer in microscopic pores, the microscopic oil displacement effects of extended carboxylate surfactant （C₈P₁₅E₁₀C）, polymer and their mixed solution after formation water flooding were studied by microscopic visualization oil displacement experiment using simulated microfluidic chips, and the results were correlated with those of interfacial tension, bulk viscosity and emulsification performance. It was found that the high viscosity of the polymer effectively reduced the mobility ratio, increased the sweep region, and could peel off the residual oil through the normal stress difference generated by viscoelasticity, and thus improved the microscopic oil washing efficiency. Partially hydrolyzed polyacrylamide Baomo Ⅱ and hydrophobically modified polyacrylamide France Ⅲ could increase the oil displacement efficiency by 8.0% and 15.2%, respectively, compared with water flooding, and the remaining oil types are mainly cluster and column. The extended surfactant could reduce the oil-water interfacial tension to the order of magnitude of 10^-2 mN/m, in-situ emulsify the residual oil after water flooding, effectively utilize the columnar residual oil, and thus improved the oil washing efficiency within the sweep region. Compared with water flooding, the oil displacement efficiency was further increased by 9.6%, the number of residual oil droplets was significantly increased, and the proportion of columnar residual oil area was the lowest among different types of chemical floodings. For the surfactant-polymer binary flooding system, the synergism between the thickening effect of the polymer and the interfacial tension reduction by the surfactant could not only expand the sweep region, but also effectively move the cluster remaining oil with the largest area, and thus increase the oil washing efficiency. After water flooding, the oil displacement efficiency was further increased by approximately 30% by using the binary flooding system, which was significantly better than that of either single system.

Key words: extended surfactant, partially hydrolyzed polyacrylamide, ultra-high molecular weight copolymer, chemical flooding, oil displacement mechanism

CLC Number:

TQ423

Jing Shi, Lei Zhang, Xingfeng Chen, Shufeng Guo, Binlin Pan. Study on oil displacement mechanism of chemical flooding based on extended surfactant[J].China Surfactant Detergent & Cosmetics, 2025, 55(12): 1501-1508.

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References 20

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驱油体系	体相黏度/（mPa·s）	界面张力/（mN/m）	水驱/%	化学驱/%	比水驱提高/%	后续水驱提高/%
宝莫Ⅱ型	11.7		33.7	41.7	8.0	0.3
法国Ⅲ型	22.0		34.6	49.8	15.2	0.1
C₈P₁₅E₁₀C	1.0	0.035 6	31.4	41.0	9.6	0.1
C₈P₁₅E₁₀C+宝莫Ⅱ型	10.4	0.113 9	30.7	59.9	29.2	0.5
C₈P₁₅E₁₀C+法国Ⅲ型	11.2	0.127 1	41.6	73.1	31.5	0.5

Study on oil displacement mechanism of chemical flooding based on extended surfactant

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