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采用瓶试法考察了原油组成及疏水缔合聚合物(Hydrophobically associating polymer,HAP)质量浓度对原油乳状液稳定性的影响,用油-水界面张力、界面电性、界面扩张流变、界面剪切黏度等多个参数表征了HAP驱采出液油-水界面性质的变化规律,用一系列酚胺树脂聚醚破乳剂对模拟采出液进行破乳。结果表明,原油中胶质和沥青质是影响原油乳状液稳定的重要因素;实验浓度范围内,随着HAP浓度升高,原油乳状液稳定性增强。HAP具有界面活性,吸附在油-水界面可降低界面能,利于乳化;HAP在界面上形成交联网状结构,提升了界面膜的扩张模量和剪切模量,同时增强了界面膜的负电性,利于稳定乳状液。环氧乙烷与环氧丙烷各占一半的酚胺树脂聚醚破乳剂与1%甲苯二异氰酸酯(TDI)交联后,5min即可完全将原油乳状液破乳。
The effects of crude oil composition and the concentration of Hydrophobically Associating Polymer (HAP) on the stability of crude oil emulsion were investigated by bottle test. The effects of oil-water interfacial tension, interfacial electrical properties, interfacial expansion rheology, Shear viscosity and other parameters were used to characterize the variation of the oil-water interfacial property of HAP flooding. A series of phenolic resin polyether demulsifiers were used to demulsify the simulated production fluid. The results showed that the gelatin and asphaltene in crude oil were the important factors affecting the stability of crude oil emulsion. The stability of crude oil emulsion increased with the concentration of HAP in the experimental concentration range. HAP has interfacial activity. Adsorption at the oil-water interface reduces the interfacial energy and facilitates emulsification. HAP forms a cross-linked network structure at the interface, which increases the expansive modulus and shear modulus of interfacial film and enhances the negative charge Sex, conducive to stable emulsion. Epoxy ethane and propylene oxide each half of the phenolic resin polyether demulsifier and 1% toluene diisocyanate (TDI) cross-linked, 5min to completely demulsify the crude oil emulsion.