不同聚合物对绥中原油乳状液稳定性影响研究

发布时间：2018-05-16 14:06

本文选题：原油组分 + 聚合物　；参考：《中国石油大学(华东)》2015年硕士论文

【摘要】：聚合物驱作为一种重要的三采技术,能够大幅度提高原油采出率,但含聚采出液乳化严重,处理十分困难。本文以绥中36-1原油作为研究对象,利用液固吸附色谱法将绥中原油分为沥青质、胶质、饱和分和芳香分极性四组分,利用溶剂法将其分为胶质、沥青质、油分三组分。测定了绥中原油及活性组分的相对分子质量、元素含量、酸值、碱氮值、红外光谱等基本性质。结果表明,胶质、沥青质具有较强的活性,二者的氧、氮、硫含量均比较高;沥青质的数均分子量最大、杂原子含量最高、不饱和度最高,其结构比较复杂。系统研究了原油及活性组分模拟乳状液的稳定性,以及HPAM和疏水缔合聚合物AP-P4对原油及其活性组分模拟乳状液的稳定性的影响。研究发现,原油及活性组分模拟乳状液的稳定性大小依次为:沥青质原油胶质油分。模拟体系加入聚合物后,AP-P4更能增强了模拟乳状液的稳定性,但也加大了后期油水分离的难度。考察了两种不同聚合物对原油及组分的界面张力和界面粘弹性的影响。结果表明:聚合物的加入降低了油水界面张力。随着聚合物浓度的增加,原油、胶质和沥青质的油水界面张力先降低后升高,在一定浓度范围内可以降低油水界面张力,但是超过这个浓度之后,界面张力升高,其原因是聚合物的吸附开始顶替油水界面上的活性物质;但聚合物AP-P4和HPAM的加入对降低油水界面张力影响不大。随着聚合物浓度的增加,原油及其活性组分的界面稳定性逐渐增强,原油及其活性组分扩张粘弹性的变化趋势是:扩张模量、扩张粘性和扩张弹性逐渐增加,而相角则随之降低。当聚合物浓度一定时,随着扩张频率的增大,界面膜的扩张模量和扩张弹性逐渐升高,扩张粘度和相角逐渐降低,AP-P4更能增强界面膜的稳定性。
[Abstract]:Polymer flooding, as an important three-recovery technology, can greatly improve the recovery rate of crude oil, but it is very difficult to deal with because of the serious emulsification of polymer produced liquid. In this paper, Suizhong 36-1 crude oil is divided into four components by liquid-solid adsorption chromatography: asphaltene, colloid, saturated fraction and aromatic polarity. The crude oil is divided into three components by solvent method: colloid, asphaltene and oil. The relative molecular weight, element content, acid value, alkali nitrogen value and infrared spectrum of Suizhong crude oil and its active components were determined. The results show that the colloid and asphaltene have strong activity, the oxygen, nitrogen and sulfur contents of the two are all high, the number average molecular weight of asphaltene is the largest, the hetero-atomic content is the highest, the unsaturation is the highest, and the structure is more complex. The stability of crude oil and its active component simulated emulsion and the effects of HPAM and hydrophobically associating polymer AP-P4 on the stability of crude oil and its active component emulsions were systematically studied. It is found that the stability of the simulated emulsion of crude oil and its active component is as follows: asphaltene crude oil glial oil. The stability of the simulated emulsion was enhanced by AP-P4 after the addition of polymer, but the difficulty of oil-water separation in the later stage was also increased. The effects of two different polymers on interfacial tension and interfacial viscoelasticity of crude oil and its components were investigated. The results showed that the interfacial tension of oil and water was decreased with the addition of polymer. With the increase of polymer concentration, the oil-water interfacial tension of crude oil, colloid and asphaltene decreases first and then increases. In a certain concentration range, the oil-water interfacial tension decreases, but when the concentration exceeds this concentration, the interfacial tension increases. The reason is that the adsorption of polymer begins to replace the active substances at the oil-water interface, but the addition of polymer AP-P4 and HPAM has little effect on reducing the interfacial tension between oil and water. With the increase of polymer concentration, the interfacial stability of crude oil and its active components increases gradually. The tendency of viscoelastic expansion of crude oil and its active components is that the modulus of expansion, the viscosity of expansion and the elasticity of expansion increase gradually. The phase angle decreases with it. When the concentration of polymer is constant, with the increase of expansion frequency, the expansion modulus and expansion elasticity of the interfacial film increase gradually, and the stability of the interfacial film is enhanced by decreasing the expansion viscosity and phase angle.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE624.1

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